A ball is thrown vertically upwards. It goes to a height 20 m and then returns to the ground. Taking acceleration due to gravity g to be 10 m s^-2
find —
(a) the initial velocity of the ball
(b) the final velocity of the ball on reaching the ground and
(c) the total time of journey of the ball.

Question

A ball is thrown vertically upwards. It goes to a height 20 m and then returns to the ground. Taking acceleration due to gravity g to be 10 m s^-2
find —
(a) the initial velocity of the ball
(b) the final velocity of the ball on reaching the ground and
(c) the total time of journey of the ball.

KnowledgeBoat · Accepted Answer

As we know, from the equation of motion, v² = u² - 2gs (a = - g as movement is against gravity ) Given, s = 20 m g = 10 m s^-2 v = 0 Substituting the values in the formula, we get, Hence, initial velocity of the ball = 20 m s^-1 (b) As we know, from the equation of motion, v² = u² + 2gs When the ball starts falling after reaching the maximum height, it's velocity (u) = 0 s = 20 m g = 10 m s^-2 Substituting the values in the formula, we get, Hence, final velocity of the ball on reaching the ground = 20 m s^-1 (c) As we know, total time of of journey of ball (t) = and u = 20 m s^-1 g = 10 m s^-2 Substituting the values in the formula, we get, Hence, total time for which the ball stays in air = 4 s

Physics

A ball is thrown vertically upwards. It goes to a height 20 m and then returns to the ground. Taking acceleration due to gravity g to be 10 m s^-2
find —
(a) the initial velocity of the ball
(b) the final velocity of the ball on reaching the ground and
(c) the total time of journey of the ball.

Laws of Motion

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A ball is thrown vertically upwards. It goes to a height 20 m and then returns to the ground. Taking acceleration due to gravity g to be 10 m s-2find —(a) the initial velocity of the ball(b) the final velocity of the ball on reaching the ground and(c) the total time of journey of the ball.

Laws of Motion

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find —
(a) the initial velocity of the ball
(b) the final velocity of the ball on reaching the ground and
(c) the total time of journey of the ball.

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