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in Force and Motion by (48.1k points)
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A car initially moving with a speed of 10m/s is uniformly accelerated for 20 seconds. Value of acceleration is 4 m/s. What will be its velocity after 20 seconds and what distance it will cover in 20 sec?

1 Answer

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by (49.3k points)
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Best answer

From first equation of motion,

v = u + at

or v = 10 + 4 x 20

= 10 + 80 = 90m/s

Again from second equation of motion

s = ut + \(\frac{1}{2}\) at2

⇒ s = 10 x 20 + \(\frac{1}{2}\) x 4 x (20)2

⇒ 200 + \(\frac{1}{2}\) x 4 x 400

⇒ s = 200 + 800 

= 1000 metres

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