Question

a car travelling at 60 km per hour on applying breakstopped in 10 second calculate acceleration​

Answer 1

First we convert kmph speed into m/s units.

Easy trick to do this: multiply by 5/18

Speed= 60*5/18 = 16.7m/s

according to equation of motion,

v = u + at

Speed becomes zero in 10s,

0 = 16.7 + 10a

16.7 = -10a

a= 16.7/10 = -1.67 m/s^2

- sign shows that it is deceleration.

Ans: deceleration= 1.67m/s^2