Question

find the initial velocity of a car which is stopped in 10 seconds by applying brakes the retardation due to barve is 2.5 m per s squar

Answer 1

As we know,
$v=u+at$
Here, $v$ is the final velocity, equal to 0.
∴$0=u+at -u=at -u=2.5m/s^2*10s$

∴$u=-25m/s$

Answer 2

acceleration A is equal to initial velocity U minus final velocity V whole by time To.
in mathematical form
A=(U-V)/T
A is given,V is given as zero(also known as rest position) .T is given.
A=(U-V)/T
=2.5=(U-0)/10
[no need of conversation of units as they all are is SI units]
=2.5=U/10
=U=2.5×10
=25 mts