a physics problem on energy, regular physics

timer Asked: Jan 26th, 2019

Question description

A child’s toy that is made to shoot 0.2kg ping pong balls consists of a tube, a spring (k = 19N/m) and catch for the spring that can be released to shoot the balls. When a ball is loaded into the tube, it compresses the spring 13.5cm.

If you shoot a ping pong ball straight up out of this toy, how high will it go?

and this other question has had me stuck and very frustrated

A box is pressed into a spring, compressing the spring by 0.2m. The spring constant is k = 210N/m. The box is released at the bottom of a frictionless ramp and reached a height of h = 0.4m.

What was the mass of the box?

any help will be gratefully appreciated! I'm trying to do good in my class and not feel left behind.

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