The identical balls A and B moving with velocities + 0.5 m/s and -0.3 m/s respectively collide head on elastically. The velocity of the balls A and B after collision will be respectively
+ 0.5 m/s and +0.3 m/s
-0.3 m/s and +0.5 m/s
+0.3 m/s and 0.5 m/s
-0.5 m/s and +0.3 m/s
A position dependent force F=(7–2x + 3x2) N acts on a small body of mass 2 kg and displaces it from x = 0 to x = 5m.
Work done in joule is
35
70
135
270
Two masses 1g and 9g are moving with equal kinetic energies. The ratio of the magnitudes of their respective linear momenta is
1 : 9
9 : 1
1 : 3
3 : 1
A stone is thrown at an angle of 45o to the horizontal with kinetic energy K. The kinetic energy at the highest point is
K
zero
If kinetic energy of a body is increased by 300% then the percentage change in momentum will be
100%
150%
265%
73.2%
A bomb of mass 30kg at rest explodes into two pieces of masses 18kg ad 12kg. The velocity of 18kg mass is 6ms-1. The kinetic energy of the other mass is
256 J
486 J
524 J
324 J
A shell of mass 200 gm is ejected from a gun of mass 4kg by an explosion that generates 1.05 kJ of energy. The initial velocity of the shell is
100 ms-1
80 ms-1
40 ms-1
120 ms-1
A metal ball of mass 2kg moving with a velocity of 36 km/h has a head on collision with a stationary ball of mass 3 kg. If after the collision, the two balls move together, the loss in kinetic energy due to collision is
140 J
100 J
60 J
40 J
How much water a pump of 2 k W can raise in one minute to a height of 10 m.? (Take g = m/s2)
1000 L
1200 L
100 L
2000 L
A body of mass 1kg is thrown upward with a velocity 20 ms-1.It momentarily comes to rest after attaining a height of 18m. How much energy is lost due to air friction ? ( g = 10 ms-2)
20 J
30 J
10 J.
