A coin is dropped from a hot-air balloon that is 290 m above the ground and risi

Question

A coin is dropped from a hot-air balloon that is 290 m above the ground and rising at 7.5 m/s upward. For this problem use a coordinate system in which up is positive.

A. Find the maximum height reached for the coin in meters. (answer is -292.9)

B. Find its position 4.00 s after being released in m. (answer is 241.6)

C. Find its velocity 4.00 s after being released m/s. (answer is -31.7)

D. Find the time before it hits the ground in seconds.

I figured out A-C, but I cannot figure out part D. Help me please!

Explanation / Answer

time os descent is t = u/g = sqrt(2*g*h)/g = sqrt(2*h/g) = sqrt(2*292.9/9.81)= 59.7 S

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