Question

A boy on motor bike is moving with a speed of 60km/ hr .suddenly a child comes in front of a bike and the boy applies brakes immediately and brings his bike to rest in 3seconds.what will be the average retarding force if the mass of boy and motor bike is 290kg

Answer 1

Answer:

Explanation:

FORCE = m x a

           

MASS = 290 KG

ACCELERATION = (V - U)/t = (60 - 0)/3 =  20 m/s

PUT THESE VALUES IN FORCE = 290 x 20

                                                     =  5800 N

HENCE THE FORCE IS = 5800 N

                                     

Answer 2

Answer:

1611.1 N

Explanation:

u=60kmh-¹ = 50/3 ms-¹

v=0

t=3s

v=u+at

0=50/3+a×3

a=-50/9 ms-²

retardation=50/9 ms-²

retardating force= 290×50/9= 1611.1 N