#### Question

Find the initial velocity of a car which is stopped in 10 seconds by applying brakes. The retardation due to brakes is 2.5 m/s^{2}.

#### Solution

We have to find the initial velocity.

Final velocity as the car stops after some time, (v) = 0 m/s

Acceleration for the entire journey, (a) = –2.5 m/s^{2}

Time taken is (t) = 10 s

Let the initial velocity be (u)

We can calculate initial velocity using 1^{st} equation of motion as, u = v – at

So initial velocity,

u = 0 – (–2.5)(10)

⇒ u = 25 m/s

Is there an error in this question or solution?

Solution Find the Initial Velocity of a Car Which is Stopped in 10 Seconds by Applying Brakes. the Retardation Due to Brakes is 2.5 M/S2. Concept: Rate of Change of Velocity.