Question

A bus moving along A straight highway with speed of 72 km per hour is brought to rest within a distance of 15 how long does it take for the bus to stop??​

Answer 1

Answer:

v=0

u=72km/h

=20m/s

s=15m

v²=u²+2as

0=(20)²+2a15

0= 400+30a

-400= 30a

a=-13.3m/s

v=u+at

0= 20 - 13 t

-20 +13=t

t= -7 s

Explanation:

Actually the que has distance as 50 m...if its 15 time is-ve and ans can be wrong..

But I have solved it by 15...