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

Physics
JAMB 1979
A 500kg car which was initially at rest travelled with an acceleration of 5m sec-2, its kinetic energy after 4 seconds was
  • A. 105J
  • B. 2.5 x 103J
  • C. 2 x 103J
  • D. 5 x 103J
  • E. 5 x 105J`
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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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