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Sagot :
The time 20s is for the rock to move up and move down back to the hand.
So we need to divide by 2.
Hence, t = 10s
a = +15m/s / 10s
a = +1.5 m/s2
So we need to divide by 2.
Hence, t = 10s
a = +15m/s / 10s
a = +1.5 m/s2
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