Question

Find the retardation production when a car moving
vilocity of 20ms-1 slows down uniformy
to 10ms-1​

Answer 1

Explanation:

Initial speed of the car is u.

Final speed of the car v=0

Let the retardation of the car be a.

Using v 2−u 2 =2aS

Or 0−u 2 =2aS

⟹ S∝u 2

(for same a)

Given : S=40m u ′=2u

∴ S/S ′= (u')2/u2 =22

Or

s'/40=4

⟹ S ′=160m

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