Question

a car decelerates from 100m/s to 60m/s in time t and the distance covered is 200m.find time t

Answer 1

This should be the ans. Thanks.

Answer 2

Answer:

u=100m/s

v=60m/s

S=200m

v^2-u^2=2aS

(60)^2-(100)^2=2a(200)

3600-10000=400a

-6400/400=a

-16m/sec^2=a

now time=

v=u+at

60=100+(-16)t

60-100=-16t

40=16t

t=40/16

t=5/2sec or 2.5 sec

Explanation: