A if the phone is 40 m above the ground when it is dropped

A hot air balloon is descending at a rate of 2.6 m/s when a passenger drops a cell phone.

(a) If the phone is 40 m above the ground when it is dropped, how long does it take for the phone to reach the ground?

(b) What is its velocity just before it lands? Choose upward as the positive direction.

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