Question

Please solve this question with proper explanation fast!!!!!​

Answer 1

Explanation:

Initial velocity(u) = 60 km/h

Final velocity(v) = 0 km/h

Time interval = 20 sec = 20/3600 h = 1/180 h

Acceleration = v-u/t

= 0 km/h - 60 km/h/1/180 h

= -60 km/h/1/180 h

= (-60×180) km/h^3

= -10800 km/h^3

Answer 2

Explanation:

initial velocity=60km\h=50\3m\s

final velocity =0

therefore a =v-u\t

=(0-50/3)/20

=-50/60 m/second square acceleration

or 50/60 m/second square retardation