NCERT Solutions for Chapter: Motion in a Straight Line, Exercise 3: VSA

A uniformly moving cricket ball is turned back by hitting it with a bat for a very short time interval. Show the variation of its acceleration with time. (Take acceleration in backward direction as positive).

Give examples of a one-dimensional motion where the particle moving along positive x-direction comes to rest periodically and moves forward.
 

Give examples of a one-dimensional motion wherethe particle moving along positive $x$ -direction comes to rest periodically and moves backward.

Give example of a motion where $x>0, \mathrm{v}<0$ and $a >0$ at a particular instant.

An object falling through a fluid is observed to have acceleration given by a $a=g-bv;$ where $g=$ gravitational acceleration and $b$ is a constant. After a long time of release, it is observed to fall with constant speed. What must be the value of constant speed?