Question

a moving train is brought to rest within 20 seconds by applying brakes find initial velocity is the retardation due to break sister 1.5 metre per second s(2)
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Answer 1

Answer: 30m/s

Step-by-step explanation:

Given=> t=20

a=-1.5m/s square

v=0

u=?

Solution

v=u+at

0=u+(-1.5)(20)

0=u-30

u=30m/s

THEREFORE INITIAL VELOCITY WAS 30 METRE PER SECOND