Question

A ball is thrown horizontally at a speed 20 m/s from a height 10 m. Find the time it takes to strike the ground. Also find the horizontal range of throw.

Answer 1

Answer:

given that

initial speed =v

height 20 m

this speed will remain constant throughout the journey

horizontal components of velocity when

vx=u

v2y=2gh

v2=2*9.8*20. v2=392m2/ s2

v+392=3u

9u2=v2+392

v2=49

v=7m/s.

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