Question

Find the initial velocity of a car which is stopped in 10 seconds by applying brakes retardation duty brakes is 2.5 metre per second square

Answer 1

Answer:

initial velocity = u

final velocity(v)= 0

time = 10 s

retardation(-a)= 2.5 m/s^2

we know, v^2 = u^2 -2as

or, (0)^2= u^2 - 2 ×10 2.5

$=> {u}^{2} = 2 \times 25$

$=> u = \sqrt{2 \times 25}$

$=> u = 5 \times \sqrt{2} \\ = > u = 5 \times 1.414 \\ = > u = 7.07$

initial velocity is 7.07m/s

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