First slide

Work

Question

The velocity of a body of mass 3kg is increased from $10 m s^{- 1}$ to $14 m s^{- 1}$ under the influence of external force. The network done by external force is

Moderate

A

144J
B

164J
C

210J
D

240J

Solution

$\begin{array}{l} W = \frac{1}{2} m (v^{2} - u^{2}) \\ W = \frac{1}{2} \times 3 [196 - 100] = \frac{1}{2} \times 3 \times 96 \\ W = 144 J \end{array}$

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