Advertisements
Advertisements
Question
Can you suggest a real-life example about the motion of a body from the following velocity – time graph?

Advertisements
Solution
Suppose a train starts from rest and accelerates uniformly for some time and then moves with a constant velocity for a certain time interval. Then on applying the brakes, the train is uniformly retarded and comes to rest after some time in this situation, velocity – time graph of the train will be the same as shown in the figure.

APPEARS IN
RELATED QUESTIONS
Which of the two can be zero under certain conditions : average speed of a moving body or average velocity of a moving body ?
Give one example of a situation in which a body has a certain average speed but its average velocity is zero.
Fill in the following blank with suitable word :
Velocity is the rate of change of……………………… It is measured in.............. .
Describe the motion of a body which is accelerating at a constant rate of 10 m s–2. If the body starts from rest, how much distance will it cover in 2 s ?
Derive the formula : v = u + at, where the symbols have usual meanings.
A bus increases its speed from 36 km/h to 72 km/h in 10 seconds. Its acceleration is :
The slope of a speed-time graph gives:
A body starts from rest and acquires a velocity 10 m s-1 in 2 s. Find the acceleration.
A car starting from rest acquires a velocity 180m s-1 in 0.05 h. Find the acceleration.
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.

