Embibe Experts Solutions for Chapter: Laws of Motion, Exercise 1: COMEDK UGET 2014

A man weighing $70 \mathrm{kg},$ riding a motorbike weighing $230 \mathrm{kg}$ at $54 \mathrm{km} {\mathrm{h}}^{-1}$ accelerates at $1 \mathrm{m} {\mathrm{s}}^{-2}$, when suddenly a child rushes into the road. The rider manages to apply brakes screeching to bring his vehicle to a halt in $3 \mathrm{s},$ just in time to save the child. What should have been the average retarding force on the vehicle?

Which one of the following represents uniform motion?

A monkey of mass $40 \mathrm{kg}$ climbs up a rope which can stand a maximum tension of $600 \mathrm{N}$.The rope will break when the monkey

A tennis ball of mass $m$ strikes a wall with a velocity $v$ and retraces the same path. Calculate the change in momentum.