Question

A ball is thrown vertical upward at the reaches at height 90 m find the velocity with which it was thrown

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Answer 1

Answer:

42 m/s

Explanation:

Let initial velocity with which ball was thrown upwards be u m/s

Final velocity as it reaches top height of 90 m is 0 m/s

acceleration due to gravity = -9.8 m/(s)^2

Using formula

(v)^2 - (u)^2 = 2(-g)h

0 - (u)^2 = 2×(-9.8)×90

(u)^2 = 1764

u = √1764

u = 42 m/s