A car is running with a velocity of 72 km/hr. If it is brought to rest

1.	A car is running with a velocity of 72 km/hr. If it is brought to restsuddenly by applying brakes by seeing a child 30 metre ahead onthe road and bus stops at a distance of 20 metre, calculatei) retardation of the carii) time taken by the car to come to rest.
Answer» ANSWER: Correct OPTION is D 0.25 s v=72km/hr= 18 72×5 =20m/s Time TAKEN to COVER the distance of 5m is: t= 20 5 =0.25sec This time is called REACTION time.

A car is running with a velocity of 72 km/hr. If it is brought to restsuddenly by applying brakes by seeing a child 30 metre ahead onthe road and bus stops at a distance of 20 metre, calculatei) retardation of the carii) time taken by the car to come to rest.

Answer»

Correct OPTION is

0.25 s

v=72km/hr=

72×5

=20m/s

Time TAKEN to COVER the distance of 5m is:

=0.25sec

This time is called REACTION time.