ESE 2021 Technical Quiz || Impulse, Momentum & Collisions

An object of mass 5.0 kg falls from rest through a vertical distance of 20 m and acquires a velocity of 10 m/s. What is the work done by the air resistance on the object? Take g= 10 m/s²

Find out the correct statement.

1) Impulse = Final momentum - initial momentum

2) Momentum = mass × velocity

3) momentum = mass × acceleration

4) unit of impulse is N-sec

5) unit of impulse is

A man of weight 100 N moving horizontal with a velocity of 5 m/sec jumps off from a bridge to a boat. Weight of boat is 1000 N. if boat has no initial velocity then horizontal velocity of boat (g = 10 m/sec²)

The time period of oscillation of following spring mass system is