A person holding a lunch bag is moving upward in a hot air balloon at a constant speed of 7.7 m/s . When the balloon is 21 m above the ground, she accidentally releases the bag. Part A What is the speed of the bag just before it reaches the ground

The speed of the bag just before it reaches the ground is 21.71 m/s.

Explanation:

The speed of the bag can be found using the following equation:

Where:

is the final speed =?

is the initial speed = 7.7 m/s

g: is the gravity = 9.81 m/s²

y: is the height = 21 m

Therefore, the speed of the bag just before it reaches the ground is 21.71 m/s.

I hope it helps you!    

c)as speed changes, wavelength and frequency change.

everything changes!

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