Embibe Experts Solutions for Chapter: Laws of Motion, Exercise 1: Exercise 1

A hockey player is moving northward and suddenly turns westward with the same speed to avoid an opponent. The force that acts on the player is

A marble block of mass $2 \mathrm{kg}$ lying on ice when given a velocity of $6 \mathrm{m} {\mathrm{s}}^{-1}$ is stopped by friction in $10 \mathrm{s}$. Then the coefficient of friction is (Take $g=10 \mathrm{m} {\mathrm{s}}^{-2}$)

A spacecraft of mass $100 \mathrm{kg}$ breaks into two when its velocity is ${10}^4 \mathrm{m} {\mathrm{s}}^{-1}$. After the break, a mass of $10 \mathrm{kg}$ of the space craft is left stationary. The velocity of the remaining part is

A ball of mass $10 \mathrm{g}$ moving perpendicular to the plane of the wall strike it and rebounds in the same line with the same speed. If the impulse experienced by the wall is $0.54 \mathrm{N} \mathrm{s}$, the velocity of the ball is

A hammer weighing $3 \mathrm{kg}$ strikes the head of a nail with a speed of $2 \mathrm{m} {\mathrm{s}}^{-1}$ drives it by $1 \mathrm{cm}$ into the wall. The impulse imparted to the wall is

If $n$ bullets, each of mass $m$ are fired with a velocity $v$ per second from a machine gun, the force required to hold the gun in position is

A conveyor belt is moving at a constant speed of $2 \mathrm{m} {\mathrm{s}}^{-1}$. A box is gently dropped on it. The coefficient of friction between them is $\mu =0.5$. The distance that the box will move relative to belt before coming to rest on it taking $g=10 \mathrm{m} {\mathrm{s}}^{-2}$, is

A body of mass $M$ hits normally a rigid wall with velocity $V$ and bounces back with the same velocity. The impulse experienced by the body is