Question

A ball is thrown vertically upward with a speed 10m/s. Calculate the velocity of the ball just before touching the ground.

Answer 1

Answer:

Initial velocity= 10 m/s

Final velocity when the ball will reach its highest point= 0

Acceleration due to gravity= -9.8 m/s^2

We need to find time before finding the velocity of the ball before touching the ground.

g = v-u/t

=> -9.8 = 0-10/t

=> -9.8 = -10/t (then cross multiply)

=> -9.8t = -10

=> t = -10/-9.8

=> t = 1.02040816 or 1.02 s

Now, lets find the velocity of the ball before touching the ground.

v = u + gt

= 10 + (-9.8) × 1.02

= 10 + (-9.996)

= 10 - 9.996

= 1.996 m/s

Thus, the velocity of the ball before touching the ground is 1.996 m/s.

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