Question

If the velocity 'u' of a body moving along a straight line with a constant retardation 'a' is reduced by
75% in time 't', then t = ​

Answer 1

Explanation:

The body is moving with retardation therefore it gonna stop at some point therefore it's final velocity will be 0

therefore by equation v=u+at

here. 0=u-at. as here acceleration is negative

therefore u=at

75%of u = 75/100u= 3/4u

therefore 3/4 u = at'

therefore

equate the 1st 2 equation s

therefore 3/4at=at'

therefore t'= 3/4t