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Q.

Two stones are projected simultaneously with same speed 10 m/s from same point. The range of both are same and is equal to 53m . Then the difference in their time of flight is …. (g=10m/s2)

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a

3 S

b

1 S

c

(3−1) S

d

2 S

answer is C.

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Detailed Solution

If θ1=θ then θ2=90−θ R=u2sin2θg,53=210×10 sin2θ10 sin2θ=32⇒2θ=600,θ=300 T1=2usinθ1g=2×10×sin3010=1 T2=2usinθ2g=2×10×sin6010=3 Difference in time =(3−1)s

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Two stones are projected simultaneously with same speed 10 m/s from same point. The range of both are same and is equal to 53m . Then the difference in their time of flight is …. (g=10m/s2)