Advertisements
Advertisements
Question
The velocity-time graph of a moving body is given below in Figure
The acceleration in parts AB, BC and CD.
Solution
Acceleration in the part AB = Slope of AB
= tan (∠BAD)
= (30/4) ms-2
= 7.5 ms-2
Acceleration in the part BC = 0 ms-2
Acceleration in the part CD = slope of CD = -tan (∠CDA)
= -(30/2) ms-2
= -15 ms-2
APPEARS IN
RELATED QUESTIONS
Name the physical quantity which gives us an idea of how slow or fast a body is moving.
A tortoise moves a distance of 100 metres in 15 minutes. What is the average speed of tortoise in km/h ?
A car moving on a straight path covers a distance of 1 km due east in 100 s. What is the speed of the car?
A car moving on a straight path covers a distance of 1 km due east in 100 s. What is velocity of the car?
A car accelerates at a rate of 5 m s-2. Find the increase in its velocity in 2 s.
Figure shows the displacement of a body at different times .
Calculate the velocity of the body as it moves for time interval :
(i) 0 to 5 s,
(ii) 5 s to 7 s
(iii) 7 s to 9 s.
A train travels with a speed of 60 km h-1 from station A to station B and then comes back with a speed 80 km h-1 from station B to station A. Find -
- The average speed
- The average velocity of the train.
A train is moving with a velocity of 90 km h-1 . It is brought to stop by applying the brakes which produce a retardation of 0.5 ms-2 Find :
(i) The velocity after 10 s , and
(ii) the time taken by the train to come to rest .
Define uniform velocity and give one example.
Define speed of a body.
