Question

A ball is gently dropped from a height of 20 m if its velocity increases uniformly at a rate of 10 M per second with what velocity will strike the ground

Answer 1

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Answer 2

A ball is gently dropped from a height of 20 m
so height (h)= 20 m
and initial velocity (u)= 0

velocity increases uniformly at a rate of 10 M per second 
so acceleration (a)= 10 m/s²

you need to find final velocity(v).

Use formula: v² - u² = 2ah
 
v² - u² = 2ah
⇒ v² = 2ah - u²
⇒ v² = 2×10×20 - 0
⇒ v² = 400
⇒ v = √400
⇒ v = 20 m/s

It will strike the ground with 20 m/s velocity