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A ball is dropped from a helicopter at an altitude of $60\text{ meters}$.

If the helicopter is moving upward at a speed of $20\text{ m/s}$, what is the velocity of the ball when it hits the ground?

Assume acceleration due to gravity is $9.8 \text{ m/s}^2$.

A

$-59.591\text{ m/s}$

B

$- 39.699\text{ m/s}$

C

$-39.691\text{ m/s}$

D

$79.698\text{ m/s}$

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