Question

The driver of a three-wheeler moving with a
speed of 36 km/hr sees a child standing in the
middle of the road and brings his vehicle at
rest in 0.4s just in time to save the child. The
average retarding force on the vehicle is (The
mass of the three - wheeler is 400kg and the
mass of the driver is 65kg)
1) 1.2 x 10°N 27 1.2 x 10^N
4) 1.2 x 10N
3) 1.2x10 N​

Answer 1

Answer:

1.2*10^4N

Explanation:

Simple

V=u+at

0=10+a*0.4...........36*5/18=10 m/s

A=25m/s^2

So f=m*a

=465*25=1.2*10^4N

Answer 2

Answer:

answer in attachment