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A ball is thrown directly downward with an initial speed of 7.30 m/s, from a height of 29.0 m. After what time interval does it strike the ground?

Sagot :

Time taken by the ball to reach the ground is 1.8s.

What is free falling?

When an object is released from rest in free air considering no friction, the motion is depend only on the acceleration due to gravity, g.

A ball is thrown directly downward with an initial speed of 7.30 m/s, from a height of 29.0 m

Using the second equation of motion,

s = ut + 1/2 at²

Plug the values, we get

29 = 7.3t + 1/2 x9.81t²

4.905t² + 7.3t -29 =0

t =1.79871 or −3.28699

As time can't be negative, time taken to strike the ground is  approximately 1.8 s.

Learn more about free falling.

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