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Standard XII

Physics

Work Done in Collision

A tennis ball...

Question

A tennis ball has a mass of $56.7 g m$ and is served by a player with a speed of $180 k m p h$ . The work done in serving the ball is nearly:

710 J

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71 J

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918 J

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91.8 J

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Solution

The correct option is A $71 J$
$W . D = Δ K E$
$= \frac{1}{2} \times 56.7 \times (50)^{2} \times 10^{- 3}$
$= 70.8 J$

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A tennis ball has a mass of 56.7gm and is served by a player with a speed of 180kmph. The work done in serving the ball is nearly:

The correct option is A 71JW.D=ΔKE =12×56.7×(50)2×10−3 =70.8J

A tennis ball has a mass of $56.7 g m$ and is served by a player with a speed of $180 k m p h$ . The work done in serving the ball is nearly:

The correct option is A $71 J$
$W . D = Δ K E$
$= \frac{1}{2} \times 56.7 \times (50)^{2} \times 10^{- 3}$
$= 70.8 J$