A ball is thrown vertically downward with a velocity of 20 m s - 1 from the top of a tower. It hits the ground after some time with a velocity of 80 m s - 1 . The height of the tower is: g = 10 m s - 2

Question

A ball is thrown vertically downward with a velocity of 20 m s - 1 from the top of a tower. It hits the ground after some time with a velocity of 80 m s - 1 . The height of the tower is: g = 10 m s - 2, 340 m, 320 m, 300 m, 360 m

MARKS App · Accepted Answer

We know that, v 2 = u 2 + 2 g h ⇒ 80 2 = 20 2 + 2 × 10 h ⇒ h = 300 m

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