Question

A bus initially moving at 20m/s slows by 4 m/s/s

How much time does it take for the bus to stop?

Answer 1

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.

Step-by-step explanation: