Question

A car starts from rest, accelerates uniformly with 3m/s² for some time. Then brakes are applied and car retards uniformly after achieving a maximum velocity and finally comes to rest. If total journey time is half an hour, find the maximum velocity attained by the car.​

Answer 1

GIVEN
a=-3
v=0
t=1/2
u=?
$v = u + at \\ 0 = u + ( - 3 \times \frac{1}{2} ) \\ u = \frac{3}{2} \\ u = 1.5$
HOPE IT HELP...

Answer 2

Apply equations of motion and u will get the answer.