A baseball player friend of yours wants to determine his pitching speed. You have him stand on a ledge and throw the ball horizontally from an elevation 5.0 mm above the ground. The ball lands 20 mm away. What is his pitching speed?

Explanation:

Data provided in the question:

Height above the ground, H= 5.0m

Range of the ball, R= 20 m

Initial horizontal velocity =

Initial vertical velocity=  (Since ball was thrown horizontally only)

Acceleration acting horizontally, = 0 m/s²  [ Since no acceleration acts horizontally) ]

Vertical Acceleration, = 9.8 m/s² (Since only gravity acts on it)

Let 't' be the time taken to reach ground

Therefore, using equations of motion, we have

Then using Equations of motion for horizontal motion,

more than, less

less than, more

conduction, convection, radiation