Maharashtra Board Solutions for Chapter: Laws of Motion, Exercise 3: Exercise

The minimum distance between the start and finish points of the motion of an object is called the _____ of the object.

Deceleration is _____ (negative / positive) acceleration.

When an object is in uniform circular motion, its _____ (speed/ velocity) changes at every point.

 During collision total _____ (velocity, momentum) remains constant.

The working of a rocket depends on Newton’s _____ law of motion.

Give scientific reasons.
Even though the magnitude of action force and reaction force are equal and their directions are opposite, their effects do not get cancelled.

Give scientific reasons.

The velocity of an object at rest is considered to be uniform.

A person swims $100 \mathrm{m}$ in the first $40 \mathrm{s}$, $80 \mathrm{m}$ in the next $40 \mathrm{s}$, and $45 \mathrm{m}$ the last $20 \mathrm{s}$. What is the average speed?