Answer:
She should drop two balls with different masses from the same height
Explanation:
Number 19 is frequency and not sure which question you asked!!!??
Answer:
0.775 m
Explanation:
As the car collides with the bumper, all the kinetic energy of the car (K) is converted into elastic potential energy of the bumper (U):

where we have
is the spring constant of the bumper
x is the maximum compression of the bumper
is the mass of the car
is the speed of the car
Solving for x, we find the maximum compression of the spring:

Answer:
PE = (|accepted value – experimental value| \ accepted value) x 100%
Explanation: