A body has linear momentum P and translational kinetic energy E. If momentum becomes 2P, the kinetic energy will have the value
0.5 E
E
2E
4 E
The kinetic energy of a body is stated to increase by 300 percent. The corresponding increase in momentum of the body will be
50
100
200
300 percent
Two particles with masses in the ratio 1:4 are moving with equal kinetic energies. The magnitude of their linear momentums will confirm to the ratio
1 : 8
1 : 2
4 : 1
Two bodies of masses m and 2m are dropped from the top of a building. When these bodies reach the ground, their kinetic energies will be in the ratio
1 : 2
1 : 4
1 : 1
Two balls of same size, one of mass 10 kg and other of mass 20 kg, are dropped simultaneously from a tower. When the balls are 2 m above the ground, they will have the same:
acceleration
momentum
kinetic energy
potential energy
A man weighing 60 N jumps off a railway train running
on horizontal rails at 20 km/hr with a packet weighing 100 N 10 his hand. The thrust of packet on his hand is
Zero
100 N
500 N
700 N
A body of mass 1 kg attains a velocity of 30 m/s from its rest position when a force of 6 N is applied to it. The time for which force acts on the body is
0.5 s
20.5 s
5 s
1.5 s
A truck of mass 3000 kg is moving at 10 m/s and is acted upon two forces : a forward force of 1000 N due to engine and a retarding force of 400 N due to friction. The truck then gains speed at the rate
0.2 m/s2
0.02 m/s2
0.4 m/s2
0.33 m/s2
A stationary object of 10 kg mass is acted upon by 20N force for 5 seconds. The object will attain a final velocity of
1 m/s
10 m/s
20 m/s
30 m/s
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