Question

A body is falling with 1m/s at a height of 3m from the ground. The speed at height 2m from the ground will be?
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Answer 1

Answer:

(a) 4.54 m/s

Explanation:

Case 1:

Initial velocity, u= 1m/s

height ,h= 3m

we know that,

2gh = v² - u² (let g= 9.8m/s²)

=> 2×9.8×3 = v² - 1

=> 58.8 + 1 = v²

=> v = √59.8= 7.74m/s

Case 2:

considering, the height = 2m

2gh = v² - u²

=> 2×9.8×2 = (7.74)² - u²

=> 39.2 = 59.9 - u²

=> u = √20.7

=> u = 4.54 m/s