Question

The driver of a three wheeler moving wuth a velocity of 40 km/h sees a child standing in the middle of the road and brings his vechile to rest in 5 secs just in time to save the child.what is the average retarding force on the vechile. The mass of the wheeler is500kg and the mass of the driver is 70 kg

Answer 1

Answer:

near about 1270 N. Kimdly go through the attached explanation

Answer 2

Answer:

given, U = 40km/hr , v = 0, t = 5 sec, m = 500 + 70 kg

to find retarding force u = 40*5/18 m/sec = 100/9 m/sec

f = m*a

a = (v - u)/t

retardation = (0 - 100/9)/5

= - 2.2 m/sec^2

therefore retarding force f = 570*(-2.2)

= - 1254 N