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Standard XII

Physics

Race of Rollers

A ball is thr...

Question

A ball is thrown with an initial velocity of 20 m/s at an angle of $30^{o}$ . Calculate its total flight time, assuming that air resistance is negligible.

0.5 s

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1 s

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1.7 s

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2 s

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4 s

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Solution

The correct option is C 2 s
The speed of the ball in vertical direction= $u_{y} = v s i n θ$
$= 20 \times s i n 30^{\circ} = 10 m / s$
Thus the time taken to reach the maximum height= $\frac{u_{y}}{g}$
$= 1 s$
Thus time taken to go up and come back= Total time of flight= $2 \times 1 s = 2 s$

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A ball is thrown with an initial velocity of 20 m/s at an angle of 30o. Calculate its total flight time, assuming that air resistance is negligible.

The correct option is C 2 sThe speed of the ball in vertical direction=uy=vsinθ=20×sin30∘=10m/sThus the time taken to reach the maximum height=uyg=1sThus time taken to go up and come back= Total time of flight=2×1s=2s

A ball is thrown with an initial velocity of 20 m/s at an angle of $30^{o}$ . Calculate its total flight time, assuming that air resistance is negligible.

The correct option is C 2 s
The speed of the ball in vertical direction= $u_{y} = v s i n θ$
$= 20 \times s i n 30^{\circ} = 10 m / s$
Thus the time taken to reach the maximum height= $\frac{u_{y}}{g}$
$= 1 s$
Thus time taken to go up and come back= Total time of flight= $2 \times 1 s = 2 s$