Question

a body is moving in a straight line with constant disaccleration 'a' losses 3/4th of its initial velocity u what is time of it

Answer 1

acceleration = -a
initial velocity = u
final velocity = v
time = t
v = u - 3u/4 = u/4

v = u + (-a)t
⇒u/4 = u - at
⇒at = u - u/4
⇒at = 3u/4
⇒ t = $\frac{3u}{4a}$