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A 500kg car which was initially at rest travelled with an acceleration of 5m sec-2, its ...

A 500kg car which was initially at rest travelled with an acceleration of 5m sec-2, its kinetic energy after 4 seconds was
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  • A 105J
  • B 2.5 x 103J
  • C 2 x 103J
  • D 5 x 103J
  • E 5 x 105J`
Correct Answer: Option A
Explanation:
K.E = \(\frac{1}{2}\)mv2; m (at + u)2
since, v = at + u = \(\frac{1}{2}\) x 500 [(5 x 4)+ 0]2
= 105J

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