Rahul walks to his school which is at a distance of 3km from his home in 30 minutes. on reaching he finds that the school is closed and cones back by a bicycle with his friend and reaches home in 20 minutes. calculate his average speed in km/hr.

answer; (arch); good luck

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                                         : )