Question

A moving train is brought to rest within 20 seconds by applying brake find the initial velocity if the retardation due to the brakes is 2 metre per square second

Answer 1

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Answer 2

Explanation:

CORRECT QUESTION :-

• ★ A moving train is brought to rest in 20 seconds by applying brakes . Find the initial velocity is the retardation due to break is 2 m/s².

GIVEN :-

• Acceleration , a = -2 m/s²

• Final velocity , v = 0 m/s

• Time , t = 20 sec

TO FIND :-

• The initial velocity , u.

SOLUTION :-

★ By using 1st equation of motion ★

→ v = u + at

→ 0 = u + (-2) × 20

→ 0 = u - 40

→ u = 40 + 0

→ u = 40

Hence the required initial velocity is 40 m/s.