Question

a car moving with a speed of 30ms_1upon the application of brakes comes to rest within a distance of 5m .the retardation produced by the brakes is ​

Answer 1

Answer:

V=0

U=20m/s

S=10m

Hence, Newton's equation...

V^2= U^2+2as

20^2= -2(10)a

a= 400/-20

a= -20m/s^2

Answer 2

Answer: -187.5 m/s2

Explanation: initial velocity= 30 m/s

Final velocity= 0 m/s

Velocity= distance / time

Time= distance/ velocity

= 5/ 30

= 0.16

Retardation= final velocity- initial

velocity/ time

= 0- 30/ 0.16

= -187.5 m/s2