Question

❤❤❤Hey❤❤❤
A driver of a three wheeler moving with a speed of 10 m/s sees a child standing in the
middle of the road and brings his vehicle to rest in 4 s just in time to save the child.
What is the average retarding force on the vehicle? The mass of the three- wheeler is
400 kg and the mass of the driver is 80 kg.
Carries 2 Marks
Class 11 CBSE

Answer 1

Answer:

The initial velocity = 10m/s

The final velocity = 0

The time taken = 4s

by the formula

v = u+at

0 = 10 + 4a

therefore retardation 'a' = 2.5m/s^2

Total mass of the three wheeler = 400+80 = 480kg

By the formula

F = ma

Retardation force = 480 × 2.5

= 1200N

Hope it helps..

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