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Standard IX

Physics

Introduction to Equations of Motion

A block start...

Question

A block starts accelerating at $5 m / s^{2}$ from rest on a frictionless surface. Calculate the distance traveled by the block in first 4 seconds?

20 m

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40 m

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80 m

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120 m

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160 m

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Solution

The correct option is B 40 m
Given : $u = 0$ $a = 5 m / s^{2}$ $t = 4$ s
Using $S = u t + \frac{1}{2} a t^{2}$
$∴$ Distance covered in 4 s $S = 0 + \frac{1}{2} \times 5 \times 4^{2} = 40$ m

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A block starts accelerating at 5m/s2 from rest on a frictionless surface. Calculate the distance traveled by the block in first 4 seconds?

The correct option is B 40 mGiven : u=0 a=5m/s2 t=4 sUsing S=ut+12at2∴ Distance covered in 4 s S=0+12×5×42=40 m

A block starts accelerating at $5 m / s^{2}$ from rest on a frictionless surface. Calculate the distance traveled by the block in first 4 seconds?

The correct option is B 40 m
Given : $u = 0$ $a = 5 m / s^{2}$ $t = 4$ s
Using $S = u t + \frac{1}{2} a t^{2}$
$∴$ Distance covered in 4 s $S = 0 + \frac{1}{2} \times 5 \times 4^{2} = 40$ m