A crane raises a crate with a mass of 150 kg to a height of 20 m. Given that the acceleration due to gravity is 9.8 m/s2, what is the crate's potential energy
at this point?
O A. 306
B. 294,000 J
O C. 29,400 J
O D. 720 j

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

When you jump from an elevated position you usually bend your knees upon reaching the ground. by doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. in this way the average force your body experiences is a) less than 1/10 as great. b) more than 1/10 as great. c) about 1/10 as great. d) about 10 times as great.

Estimate the schwarzschild radius (in kilometers) for a mini-black hole formed when a superadvanced civilization decides to punish you (unfairly) by squeezing you until you become so small that you disappear inside your own event horizon. (assume that the your weight is 50 kg)