As a science project, you drop a watermelon off the top of the empire state building, 320 m above the sidewalk. it so happens that superman flies by at the instant you release the watermelon. superman is headed straight down with a speed of 39.0 m/s.

how fast is the watermelon going when it passes superman?

The velocity of watermelon when it passes Superman is 78 m/s.

Explanation:

Height of the building, d = 320 m

Speed of the superman, v = 39 m/s

We need to find the speed of watermelon when it passes Superman. Let t is the time taken by the watermelon. So,

Here u = 0

t = 7.95 seconds

Let v is the speed of the watermelon. It is given by :

v = 77.91 m/s

or

v = 78 m/s

So, the velocity of watermelon when it passes Superman is 78 m/s.

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it