Work, Energy an...

Two solid rubber balls A and B having masses 200 & 400 gm respectively are moving in opposite direction with velocity of A equal to 0.3 m/sec. After collision, the two balls come to rest when the velocity of B is :

A neutron travelling with a velocity v and K.E ‘E’ collides perfectly elastically head on with nucleus of an atom of mass number A at rest. The fraction of total energy retained by the neutron is :

A shell initially at rest explodes into two pieces of equal mass, the two pieces will :

If water falls from a dam into a turbine wheel 19.6 m below then velocity of water at turbine, is (Take g = 9.8 m/s²)

A bomb of mass 1 kg is thrown vertically upwards with a speed of 100 m/s. After 5 seconds, it explodes into two fragments. One fragment of mass 400 gram is found to go down with a speed of 25 m/s. what will happen to the second fragment just after the explosion? (g = 10 m /s²)

A spring of force constant 800 N/m has an extension of 5 cm. The work done in extending it from 5 cm to 15 cm is

A ball whose K.E. is E is projected at an angle of 45⁰ to the horizontal.The kinetic energy of the ball at the highest point of its flight will be

The kinetic energy K of a particle moving in a straight line depends on the distance s as K = as². The force acting on the particle is

A bullet is fired normally on a wooden plank, which is immovable. It loses 25% of its momentum in penetrating a thickness of 3.5 cm the total thickness penetrated by the bullet is

A tennis ball falls freely from a height H on to an inclined smooth plane making an angle of 45⁰ with horizontal. After bouncing, the ball falls on the plane again. The distance between the two points where the ball strikes the plane is