Embibe Experts Solutions for Chapter: Laws of Motion, Exercise 2: Level 2

Two billiard balls of equal mass $30 \mathrm{g}$ strike a rigid wall with same speed of $108 \mathrm{km} {\mathrm{h}}^{-1}$ (as shown) but at different angles. If the balls get reflected with the same speed, then the ratio of the magnitude of impulses imparted to ball $a$ and ball $b$ by the wall along $X$ direction is:

A car moves at a speed of $36 {\mathrm{kmh}}^{-1}$ on a level road. The coefficient of friction between the car tyres and the road is $0.8$. The car negotiates a curve of radius $R$. If $g=10{ \mathrm{ms}}^{-2}$, the car will skid (or slip) while negotiating the curve, if the value of $R$ is

Two forces of $6 \mathrm{N}$ and $3 \mathrm{N}$ are acting on the two blocks of $2 \mathrm{kg}$ and $1 \mathrm{kg}$ kept on frictionless floor. What is the force exerted on $2 \mathrm{kg}$ block by $1 \mathrm{kg}$ block?

In the system shown in the figure, the acceleration of the $1 \mathrm{kg}$ mass and the tension in the string connecting $A$ and $B$ is,

The normal reaction $N$ for a vehicle of $800 \mathrm{kg}$ mass, negotiating a turn on a $30°$ banked road at maximum possible speed without skidding is ____ $\times {10}^3 \mathrm{kg} \mathrm{m} {\mathrm{s}}^{-2}$.

If a block of mass ' $m$ ' placed on a plane inclined at an angle $\theta$, is on the verge of sliding, then the coefficient of friction between the block and the plane is given by

A force of $50$ dynes is acted on a body of mass $5 \mathrm{g}$ which is at rest for an interval of $3 \mathrm{s},$ then impulse is

A body of mass $0.5 \mathrm{kg}$ is projected under gravity with a speed of $98 {\mathrm{ms}}^{-1}$ at an angle of $60°$ with the vertical. The change in momentum [in magnitude] of the body when it returns on ground is