R P Manchanda, Dr. Neha Jindal and, Ms. Archita Baruah Bhattacharyya Solutions for Chapter: Practice Paper 5, Exercise 1: 5; PRACTICE PAPER

Navin travels along a straight road 500 m long and returns back 100 m. Find his average speed and average velocity if he takes a time of half an hour.

The brake applied to a car produce an acceleration of $6 {\mathrm{ms}}^{-2}$ in opposite direction to the motion. If the car takes $2 \mathrm{s}$ to stop after the application of brakes, calculate the distance it travels during this time.

Which disease is the leading cause of infant mortality? What is its main cause?

A karate player suddenly reduces the speed of his hand while hitting an ice slab. Give reason.

Glassware are covered with paper and straw while transportation. Give reason.

A cricket ball of mass $70 \mathrm{g}$ moving with a velocity of $0.5 \mathrm{m} {\mathrm{s}}^{-1}$ is stopped by a player in $0.5 \mathrm{s}$. What is the force applied by the player to stop the ball?

Prove that acceleration due to gravity is independent of mass of the falling body.

List two differences between 'G' and 'g'.