Answer: Option D View the video for explanation

For such questions, it is useful to understand conservation of energy. Work done by the pushing force = GPE + KE + work done against...

Answer: Option D The most common mistake is to equate total energy at X equals to total energy at Y. At Y, there is no way to know the...

Answer: Option B Using conservation of energy (COE), the total energy of the car at X = total energy at Y. At X, the car only has...

Answer: Option C With first glance, we may think of using kinematics to solve. It can, but the process will be longer. Refer to the...

This question is very straight forward. As both P and Q are copper, the density will be the same. But many are unsure of KE. Let look at...

The video below demonstrates that water will find its own level. An question requires this concept: An apartment block receives water...

Ans: Option C

First astronauts launched by SpaceX returned home safely on 3 Aug 2020.

Page 4 of Work Energy and Power: Understanding COE

There are 3 scenarios with slight variations. Calculate the force F needed to pull the block up the inclined plane. View the video below...

When an object is oscillating or vibrating in a wave motion , the speed of the object varies along the path. In this video, there are...

Answer: Option B Since water will naturally reach 40m high from the bottom of the apartment, you only need to pump the water up by a...

Work done W = F x d Only when there is distance moved in the direction of the force , there is work done. (i.e. look for the distance...