Advertisements
Advertisements
प्रश्न
Figure shows the velocity-time graphs for two cars A and B moving in the same direction. Which car has greater acceleration? Give reasons to your answer.
उत्तर
Car B has greater acceleration because the slope of line B is more than the slope of line A.
APPEARS IN
संबंधित प्रश्न
What is meant by the term retardation? Name its S.I. unit.
A bullet initially moving with a velocity 20 m/s strikes a target and comes to rest after penetrating a distance 10 cm into the target. Calculate the retardation caused by the target.
A car travels with uniform velocity of 25 m s-1 for 5 s. The brakes are then applied and the car is uniformly retarded and comes to rest in further 10 s. Find:
- The distance which the car travels before the brakes are applied,
- Retardation and
- The distance travelled by car after applying the brakes.
A racing car is moving with a velocity of 50 m/s. On
applying brakes, it is uniformly retarded and comes to rest in 20 seconds. Calculate its acceleration.
Convert the following acceleration:
7200 km/h2 into m/s2
A boy throws a ball up and catches it when the ball falls back. In which part of the motion the ball is accelerating?
The value of acceleration for a body at rest is ______.
Assertion: A positive acceleration of a body can be associated with the slowing down of the body.
Reason: Acceleration is a vector.
Assertion: A negative acceleration of a body can be associated with speeding up of the body.
Reason: Increase in the speed of a moving body is independent of its direction of motion.
What is the difference between uniform acceleration and non–uniform acceleration?