Question

What would be the retardation if u=30 ms^-1 and v=0ms^-1 and time taken is 20 seconds?

Answer 1

Answer:

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Answer 2

Given

• Initial velocity (u) = 30m/s
• Final velocity (v) = 0 m/s
• Time taken (t) = 20s

To find

• Retardation

Solution

*First equation of motion*

➭ v = u + at

➭ 0 = 30 + a × 20

➭ 20a = - 30

➭ a = -30/20

➭ a = - 1.5 m/s

Hence,

• Retardation of body = 1.5m/s
• Minus shows retardation

Extra Information

• s = ut + ½ at² [second equation of motion]
• v² = u² + 2as [third equation of motion]

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