Questions in Laws of Motion

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There is a simple pendulum hanging from the ceiling of a lift. When the lift is stand still, the time period of the pendulum is T. If the resultant acceleration becomes $g/4,$ then the new time period of the pendulum is
A man of weight 80 kg is standing in an elevator which is moving with an acceleration of $6\,\,m/{s^2}$ in upward direction. The apparent weight of the man will be $(g = 10\,m/{s^2})$
A force of 100 dynes acts on a mass of 5 gram for 10 sec. The velocity produced is
When the speed of a moving body is doubled
A body of mass m collides against a wall with a velocity v and rebounds with the same speed. Its change of momentum is
A thief stole a box full of valuable articles of weight W and while carrying it on his back, he jumped down a wall of height ‘h’ from the ground. Before he reached the ground he experienced a load of
N bullets each of mass m kg are fired with a velocity $v\,m{s^{ - 1}}$ at the rate of n bullets per second upon a wall. The reaction offered by the wall to the bullets is given by
If a body of mass m is carried by a lift moving with an upward acceleration a, then the forces acting on the body are (i) the reaction R on the floor of the lift upwards (ii) the weight mg of the body acting vertically downwards. The equation of motion will be given by
With what minimum acceleration can a fireman slides down a rope while breaking strength of the rope is $\frac{2}{3}$ of his weight
A ball of mass m moves with speed v and it strikes normally with a wall and reflected back normally, if its time of contact with wall is t then find force exerted by ball on wall

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