Motion equation of object is how long did it move until it stops? (i think it is projectile motion, i'm not sure.)a) 5 sec b) 0,3 secc) 0,4 secd) 4 sece) 2 sec

Take the derivative to find the velocity of the object:

The object stops when :

so the answer is E.

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )