A bullet of mass `'m'` fired with a velocity `'v'` into a fixed log of wood and penetrates a distance `'s'` before coming to rest. Assuming that the path of the bullet in the log of wood I horizontal, the average resistance offered by the log of wood is

A bullet of mass 10 gm moving with a velocity .u. penetrates 4 cm in to a target before coming to rest. If the average resistance offered by the target is 200 N, the value of .u. is

A bullet loses half of its velocity in penetrating 18 cm into a block. Further distance covered by bullet before coming to rest is:

An open knife edge of mass M is dropped from a height h on a wooden floor. If the blade penetrates S into the wood, the average resistance offered by the wood to the blade is

An open knife of mass m is dropped from a height h on a wooden floor. If the blade penetrates up to the depth d into the wood. The average resistance offered by the wood to the knife edge is to the depth d into the wood, the average resistance offered by the wood to the knife edge is .

An open knife of mass m is dropped from a height h on a wooden floor. If the blade penetrates up to the depth d into the wood. The average resistance offered by the wood to the knife edge is to the depth d into the wood, the average resistance offered by the wood to the knife edge is .

A bullet of mass 50 is moving with a velocity of 500 m s^(-1) . It penetrates 10 cm into a still target and comes to rest Calculate (a) the kinetic energy possessed by the bullel and (b) the average retarding force offered by the target.

A bullet of mass m and velocity v_1 is fired into a large block of wood of mass M. The final velocity of the system is