A 0.2kg apple on an apple tree has a potential energy of 10J. It falls to the ground, converting all of its PE to kinetic energy. What is the velocity of the apple just before it hits the ground? a. 0m/s
b. 2m/s
c. 10m/s
d. 50m/s

Can anybody me with this? ? (picture included.)

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?

Acentrifuge in a medical laboratory rotates at an angular speed of 3,700 rev/min. when switched off, it rotates through 54.0 revolutions before coming to rest. find the constant angular acceleration (in rad/s2) of the centrifuge. your response is within 10% of the correct value. this may be due to roundoff error, or you could have a mistake in your calculation. carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. rad/s2