A body of mass 1 kg moves with a velocity $5 {m s}^{- 1}$ . A force is applied on it for 1 ms such that its velocity is increased to $7 {m s}^{- 1}$ . The force applied on the body is ____ N.

2000

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200

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20

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2

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Solution

The correct option is A $2000$
Given Mass $m = 1$ kg, $u = 5 m s^{- 1}$ , $v = 7 m s^{- 1}$ $t = 1 m s$ ,
Let acceleration is $a$ .
Using $v = u + a t$ $\Rightarrow 7 = 5 + a \times 1 \times 10^{- 3}$ $\Rightarrow a = 2000 m s^{- 2}$ ,
$∴ F o r c e = m a$ $\Rightarrow F o r c e = 1 \times 2000 = 2000$ N

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A body of mass 1 kg moves with a velocity 5 ms−1. A force is applied on it for 1 ms such that its velocity is increased to 7 ms−1. The force applied on the body is ____ N.

The correct option is A 2000Given Mass m=1 kg, u=5ms−1 , v=7ms−1 t=1ms,Let acceleration is a.Using v=u+at ⇒7=5+a×1×10−3 ⇒a=2000ms−2,∴Force=ma ⇒Force=1×2000=2000 N

A body of mass 1 kg moves with a velocity $5 {m s}^{- 1}$ . A force is applied on it for 1 ms such that its velocity is increased to $7 {m s}^{- 1}$ . The force applied on the body is ____ N.