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Margarita [4]
3 years ago
9

A rock,thrown straight up, takes 4.2 seconds to reach its max height (g=9.8m/s) what was the initial velocity? what was its maxi

mum height?
Physics
1 answer:
sineoko [7]3 years ago
5 0

Known data:

time=4,2s

Earth's acceleration:9.8m/s²

Formulas needed:

t=v÷g

S=vt+(gt²)÷2

Solution:

t=v÷g

4,2=v÷9,8

v=9,8×4,2

v=41,16m/s

S=vt+(gt²)÷2

S=41,16×4,2-9.8×(4,2)²÷2

S=86.436m

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