Calculate the amount of potential energy a 200 kg car has on top of a 15 m hill

Naoki's bicycle has a mass of 10 kg. if naoki sits on her bicycle and starts pedaling with a force of 168 n, causing an acceleration of 2.8 m/s2, what is naoki's mass?

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife

Which position represents spring in the southern hemisphere? a) b) c) d)