Question

train is moving with the velocity of 20 m/second It stop after 10 seconds when brakes are applied. Calculate its retardation

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Answer 1

Answer: as initial velocity is 20 m/s and final velocity is 0 m/s by

acceleration formula (final velocity - initial velocity / total time )

so (0-20/10)= -2 so retardation is -2 m/s^2

Explanation:

Answer 2

Given :-

• Initial velocity (u) = 20m/s
• Final velocity (v) = 0 {brakes are applied}
• Time taken (t) = 10s

To find :-

• Retardation

Solution :-

According to the first equation of motion

➭ v = u + at

➭ 0 = 20 + a*10

➭ - 20 = 10a

➭ a = -20/10

➭ a = - 2 m/s²

Minus shows retardation

Hence,

• Retardation of the train is 2m/s²