HELP A rightward force acts upon an object that is moving to the left such a force does
A. positive work
B. negative work
C. no work

Astone is dropped with no initial velocity from the top of a cliff and hits the ground a time of 3.9 s later. what is the height of the cliff, in units of meters? you may assume that air resistance is negligible. give the answer as a positive number question 15 a figure skater is rotating at a rate of 200 revolutions per minute. what is the angular speed, in units of rad/s? 200 o 20.9 12000 o 3.33

An object has a weight of 500 on earth what is the mass of this object

Anybody wanna ? (picture included? )