As the reference height is at B, so above that reference height is considered positive, and below the reference height it is considered negative. Hence the height-time graph is as such. Consider a vertical oscillating object, similar to the simple pendulum, the middle is the fastest.

To get a sharp image on the screen, there are various methods and concepts that you have learned and can be applied here. View the video for the explanation:

The diagram of circuit breaker may vary. So it is important that you analyse the structure of the circuit breaker in the diagram to understand how it works. The following are two examples of circuit breaker where the structures are different, but the basic working principles are the same. Video explanation part 01: 2022PPp2q10 2022PPp2q10 Suggested answers: Video explanation part 02: 2024PPp2q11 2024PPp2q11 Suggested answers:

Refer to the video below for the explanation. Related post: Velocity-time graph of ball released from rest with air resistance - Part 1...

Refer to the video below to understand how to sketch the graph. For O-Level, we just need to focus on the general shape. 2024PP Paper 2...

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

Refer to the video for the explanation. When a ball is thrown up and it comes down, the motion varies. This video will cover how the...

Refer to the video below for the explanation. When a ball is dropped and it rebounces back, the motion varies. This video will cover how...

Refer to the video below for explanation. When a ball dropped and then it re-bounces, the motion varies. This video will cover how the...

Characteristics of mirror image: • virtual (an image which cannot be formed on a screen) • same size as object • laterally inverted •...

Internal energy of a substance is the sum of kinetic energy and  potential energy of the molecules. kinetic energy  is directly...