Question

A car retarded by applying brakes at the rate of 2m/s^2. It finally stopped in 10s. Find its initial velocity.

Answer 1

Deceleration = - 2 m/s²

Time = 10 sec

Final velocity ( v ) = 0 m/s

v = u + at

0 = u + ( -2) × 10

0 = u - 20

u = 20 m/s

Answer 2

Deceleration = - 2 m/s²

Time = 10 sec

Final velocity ( v ) = 0 m/s

v = u + at

0 = u + ( -2) × 10

0 = u - 20

u = 20 m/s