Question

a car moving along a straight line at a speed of 72 km/hr stops in 5s afer the brakes are applied find its acceration

Answer 1

initial velocity, u = 72 km/h
final velocity, v = 0
time taken, t = 5s
acceleration, a =?

$u = 72 km/h=72 \times \frac{5}{18}\ m/s =20\ m/s$

$a= \frac{v-u}{t}= \frac{0-20}{5}\ m/s^2 = \frac{-20}{5}\ m/s^2 = -4\ m/s^2$

So acceleration is -4 m/s²

Answer 2

Answer:

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