A vehicle of mass $20 k g$ is moving with a velocity of $4 {m s}^{- 1}$ . Find the magnitude of the force that is to be applied on the vehicle to have a velocity of $1 {m s}^{- 1}$ after travelling a distance of $20 m$

4 N

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6 N

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7.5 N

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9.5 N

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Solution

The correct option is C $7.5 N$
Using the third equation of motion
$v^{2} = u^{2} + 2 a s 1^{2} = 4^{2} + 2 \frac{F}{20} s - 15 = 2 \times \frac{F}{20} \times 20 F = 7.5 N$

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A vehicle of mass 20kg is moving with a velocity of 4ms−1. Find the magnitude of the force that is to be applied on the vehicle to have a velocity of 1ms−1 after travelling a distance of 20m

The correct option is C 7.5NUsing the third equation of motion v2=u2+2as12=42+2F20s−15=2×F20×20F=7.5N

A vehicle of mass $20 k g$ is moving with a velocity of $4 {m s}^{- 1}$ . Find the magnitude of the force that is to be applied on the vehicle to have a velocity of $1 {m s}^{- 1}$ after travelling a distance of $20 m$

The correct option is C $7.5 N$
Using the third equation of motion
$v^{2} = u^{2} + 2 a s 1^{2} = 4^{2} + 2 \frac{F}{20} s - 15 = 2 \times \frac{F}{20} \times 20 F = 7.5 N$