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A body is moving with a velocity 1 m/s and a force F is needed to stop it within a certain distance. If the speed of the body becomes three times, the force needed to stop it within same distance would be

1.5 F

3 F

6 F

9 F

A bullet of mass m1 and moving with velocity v1 strikes a wooden block of mass m2 lying on a frictionless surface and gets embedded into it. The final velocity of the system is

(m1 + m2) v1

m1/m1 + m2 v1

m1 + m2/m1 v1

m1/(m1 + m2) v1

A body of mass m moving towards right with a constant velocity v hits another body of twice the mass moving towards left with half the velocity. If they stick together on collision, they will

come to rest

move towards right

move towards left

can come to rest or move in any direction depending upon magnitude of masses and their velocities

A force f acts for one second on a body of mass 1 kg moving with an initial velocity u. Then which of the following state

Body covers a distance (u + f/2)

Final velocity of the body is (u + f)

Change in kinetic energy of body is 1/2m f2

Momentum of the body increases of f

A rope weighing 0.5 kgf per metre run hangs from a drum for a height of 10 m. The work done in winding up the rope on the drum is

5 mkgf

10 mkgf

25 mkgf

50 mkgf

An engine delivers constant power while driving a vehicle along a straight, level and frictionless road. The distance traveled by the car in time t would be a function of

t1/2

t3/4

t3/2

t2

/

25 mkgf

40 mkgf

60 mkgf

75 mkgf

For the mass-pulley system depicted in Fig. 1.42, the mass m2 = 5 kg is placed on a smooth inclined plane of inclination a where as the mass m1 = 5 kg is hanging free. The acceleration of the system is 1.5 m/s2. If each mass is doubled, the acceleration will be

0.75 m/s2

1.5 m/s2

3.0 m/s2

A man stands on a spring weighing scale in a lift which carries him upwards with acceleration. The reading on the weighing scale will be

true weight of the man

lower than the true weight

greater than the true weight

zero

The apparent weight of a man in a lift is less than the real weight when the lift is going down

freely

under the force of gravity

with some constant velocity

with some acceleration

1.5 F

3 F

6 F

9 F

A bullet of mass m1 and moving with velocity v1 strikes a wooden block of mass m2 lying on a frictionless surface and gets embedded into it. The final velocity of the system is

(m1 + m2) v1

m1/m1 + m2 v1

m1 + m2/m1 v1

m1/(m1 + m2) v1

A body of mass m moving towards right with a constant velocity v hits another body of twice the mass moving towards left with half the velocity. If they stick together on collision, they will

come to rest

move towards right

move towards left

can come to rest or move in any direction depending upon magnitude of masses and their velocities

A force f acts for one second on a body of mass 1 kg moving with an initial velocity u. Then which of the following state

Body covers a distance (u + f/2)

Final velocity of the body is (u + f)

Change in kinetic energy of body is 1/2m f2

Momentum of the body increases of f

A rope weighing 0.5 kgf per metre run hangs from a drum for a height of 10 m. The work done in winding up the rope on the drum is

5 mkgf

10 mkgf

25 mkgf

50 mkgf

An engine delivers constant power while driving a vehicle along a straight, level and frictionless road. The distance traveled by the car in time t would be a function of

t1/2

t3/4

t3/2

t2

/

25 mkgf

40 mkgf

60 mkgf

75 mkgf

For the mass-pulley system depicted in Fig. 1.42, the mass m2 = 5 kg is placed on a smooth inclined plane of inclination a where as the mass m1 = 5 kg is hanging free. The acceleration of the system is 1.5 m/s2. If each mass is doubled, the acceleration will be

0.75 m/s2

1.5 m/s2

3.0 m/s2

A man stands on a spring weighing scale in a lift which carries him upwards with acceleration. The reading on the weighing scale will be

true weight of the man

lower than the true weight

greater than the true weight

zero

The apparent weight of a man in a lift is less than the real weight when the lift is going down

freely

under the force of gravity

with some constant velocity

with some acceleration

TO[PICS: FORCE, COLLISION

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