Answer: Option B This question can be solved using both Conservation of Energy and Kinematics. Indeed, using COE to solve will be much simpler and straight forward. But do know both methods.

Answer: Option D For this question, I will show you 3 methods to solve. What if the options are not given? The speed and time when the distance is 175 m will be unknown. And based on the basic concepts you learned in speed-time graph, you can form two equations to solve for the unknown speed and time. 1) gradient = acceleration and 2) area under= distance travelled. Some students asked about using the formula v^2 = u^2 + 2as. Though it is not in the syllabus, you can use it i

Answer: Option C View the explanation

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.

Answer: Option C View the video for explanation

Answer: Option A

Answer: Option D From the resultant force-time graph, from time to time 0 to t, there is a decreasing resultant force. Using Fnet = ma,...

Keep in mind that you can utilize the two main concepts of a speed-time graph. As object is under free-fall, the acceleration (the...

1) When a ball is thrown up and it comes down When the ball leaves the hand, there is no upward force acting on the ball. The only force...

When a ball is thrown up vertically from a height and the falls to the ground, the various kinematic graphs below shows the same motion...

Think of gradient as the steepness of a slope as you climb to the right (as time increases). 1) If it is getting steeper > increasing...

The distance-time (displacement-time) graph on the left is not related to the speed-time (velocity-time) graph. Both are of difference...

On earth, the gravitational field strength is 10 N/kg and the acceleration due to gravity is 10 ms-2 . That means when you release an...

The speed-time graph of Car A and Car B, along a straight road over 4 seconds is shown below. a) Calculate the acceleration of Car A and...

A 10 kg box is initially at rest on a rough horizontal surface and a horizontal force is then applied to it. The force varies as shown in...

A rock is thrown vertically upwards with a velocity of 29.4 m/s from the top of a building 78.4 m high. After how long will the rock...

Solutions: Option B Key concepts: Both balls are free-falling, hence both will experience the same acceleration due to gravity 10 m/s2.