PH-2491

Kinetic energy

Physics · Secondary 4 · Medium · Kinetic energy

A car of mass

1200\,\text{kg}

accelerates from rest to

20\,\text{m s}^{-1}

. Using

E_k = \tfrac{1}{2}mv^2

, what is the increase in its kinetic energy?

$2.4 \times 10^5\,\text{J}$
$4.8 \times 10^5\,\text{J}$
$9.6 \times 10^4\,\text{J}$
$1.2 \times 10^5\,\text{J}$

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