Question

A bus slams on its breaks and goes from 30 km/hr to 15 km/hr in 4 seconds. What is its acceleration?

Answer 1

Answer:

Explanation:

in this case convering km/ hr into m/s

u= 30km/hr = 8.34 m/s

v=15km/hr = 4.16 m/sec

a = (v-u)/t

  (4.16-8.34)/4=   -1.045 m/s^2 (deceleration)

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Answer 2

As we know that when brakes are applied it is called deacceleration which id negative of acceleration.

So,

(final speed-initial speed)/time = (-8.33333-4.16667)/4 = -12.5/4 = -3.125m/s

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