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The potential energy of a projectile at its maximum height is equal to its kinetic energy there. If the velocity of projection is 20 ms-1, its time of flight is (g = 10 ms-2)

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a

2 s

b

2√2 s

c

d

answer is B.

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The potential energy of a projectile at its maximum height is equal to its kinetic energy there. If the velocity of projection is 20 ms-1, its time of flight is (g = 10 ms-2)