Advertisements
Advertisements
Question
Draw a velocity versus time graph of a stone thrown vertically upwards and then coming downwards after attaining the maximum height.
Advertisements
Solution
When a stone is thrown vertically upwards, its velocity at the highest point is zero. As acceleration due to gravity (g) acts vertically downwards, so the upward motion of stone is uniformly decelerated and the downward motion is uniformly accelerated. This makes the velocity of stone while reaching ground equal to the initial velocity of stone. So the velocity-time graph will look like this.
Here, PQ corresponds to upward motion and QR corresponds to the downward motion of the stone.
APPEARS IN
RELATED QUESTIONS
Give one example of a situation in which a body has a certain average speed but its average velocity is zero.
A car is travelling along the road at 8 ms-1. It accelerates at 1 ms-2 for a distance of 18 m. How fast is it then travelling ?
A freely falling object travels 4.9 m in 1st second, 14.7 m in 2 nd second, 24.5 m in 3rd second, and so on. This data shows that the motion of a freely falling object is a case of :
A bus increases its speed from 36 km/h to 72 km/h in 10 seconds. Its acceleration is :
A car starting from rest acquires a velocity 180m s-1 in 0.05 h. Find the acceleration.
A bicycle initially moving with a velocity 5.0 m s-1 accelerates for 5 s at a rate of 2 m s-2. What will be its final velocity?
Can you suggest a real-life example about the motion of a body from the following velocity – time graph?
Can you suggest a real-life example about the motion of a body from the following velocity – time graph?
A girl walks along a straight path to drop a letter in the letterbox and comes back to her initial position. Her displacement–time graph is shown in Fig.8.4. Plot a velocity-time graph for the same.
An object starting from rest travels 20 m in the first 2 s and 160 m in the next 4 s. What will be the velocity after 7 s from the start?
