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How Long Will It Take a Force of 10 N to Stop a Mass of 2.5 Kg Which is Moving at 20 M/S ? - CBSE Class 9 - Science

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Question

How long will it take a force of 10 N to stop a mass of 2.5 kg which is moving at 20 m/s ?

Solution

We are going to find acceleration
Force = mass × acceleration
`10 = 2.5 xx a`
⇒ `10/2.5 = a`
⇒ `(10 xx 10)/(2.5 xx 10) = a`
⇒ a = 4
Now , putting these values in the equation : 
`v = u + at`
⇒ `20 = 0 + 4 xx t`
⇒ 20 = 4t
⇒ `20/4 = t`
⇒ `t = 5s`

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APPEARS IN

 Lakhmir Singh Solution for Science for Class 9 Part 1 Physics (2016 to Current)
Chapter 2: Force and Laws of Motion
Short Answers | Q: 31 | Page no. 75

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Solution How Long Will It Take a Force of 10 N to Stop a Mass of 2.5 Kg Which is Moving at 20 M/S ? Concept: Second Law of Motion.
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