Question

If a bus travelling at 20 m/s is subject to a steady deceleration of 5m/s2 ,how long will it take to come to rest?

Answer 1

If a bus travelling at 20 m/S is subject to a steady deceleration of 5m/s2, how long will it take to come to rest?

ANSWER=
Time = 4 seconds

Answer 2

Answer:

For the bus,

Initial Velocity, u = 20 m/s

Final Velocity, v = 0 m/s

Acceleration, a = -5m/s²  (minus sign because of deceleration)

Time, t = (?)

We know that,

a = (v - u)/t

∴t = (v - u)/a

∴t = (0 - 20)/(-5)

∴t = (-20)/(-5)

∴t = 4s

Thus, the bus will take 4 seconds to stop.