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Standard XII

Physics

Momentum

A ball is sho...

Question

A ball is shot in a long hall having a roof at a height of 10m with 25 m/s at an angle of $37^{o}$ with the floor. The ball lands on the floor at a distance of ___ from the point of projection. (Assume elastic collision if any)

40 m

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60 m

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$\frac{45}{4} m$

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20 m

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Solution

The correct option is A
40 m

$y = u_{y} t + \frac{1}{2} a_{y} t^{2} 10 = 15 t - \frac{1}{2} (10) t^{2} t = 1, 2 s e c$
Collision will happen at t=1s and total time of flight=2 sec
$R = 20 \times 2 = 40 m$

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A ball is shot in a long hall having a roof at a height of 10m with 25 m/s at an angle of 37o with the floor. The ball lands on the floor at a distance of ___ from the point of projection. (Assume elastic collision if any)

The correct option is A 40 m y=uyt+12ayt210=15t−12(10)t2t=1, 2 sec Collision will happen at t=1s and total time of flight=2 sec R=20×2=40 m

A ball is shot in a long hall having a roof at a height of 10m with 25 m/s at an angle of $37^{o}$ with the floor. The ball lands on the floor at a distance of ___ from the point of projection. (Assume elastic collision if any)

The correct option is A
40 m

$y = u_{y} t + \frac{1}{2} a_{y} t^{2} 10 = 15 t - \frac{1}{2} (10) t^{2} t = 1, 2 s e c$
Collision will happen at t=1s and total time of flight=2 sec
$R = 20 \times 2 = 40 m$