Question

a ball thrown in vertically upward direction rise up to a height (h) and comes back to the position of its shorts . calculate the total distance travelled by the ball​

Answer 1

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PHYSICS

A ball is thrown vertically upwards with a velocity of 49 m/s. Calculate

(i) The maximum height to which it rises.

(ii) The total time it takes to return to the surface of the earth.

October 15, 2019avatar

Akash Sabiya

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VIDEO EXPLANATION

ANSWER

Given Initial velocity of ball, u=49 m/s

Let the maximum height reached and time taken to reach that height be H and t respectively.

Assumption: g=9.8 m/s

2

holds true (maximum height reached is small compared to the radius of earth)

Velocity of the ball at maximum height is zero, v=0

v

2

−u

2

=2aH

0−(49)

2

=2×(−9.8)×H

⟹H=122.5 m

v=u+at

0=49−9.8t

⟹t=5 s

∴ Total time taken by ball to return to the surface, T=2t=10 s

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