Advertisements
Advertisements
प्रश्न
What does a positive acceleration mean?
Advertisements
उत्तर
Positive acceleration corresponds to situation when velocity is continuously increasing with respect to the time.
APPEARS IN
संबंधित प्रश्न
A toy car initially moving with uniform velocity of 18 km h-1 comes to a stop in 2 s. Find the retardation of the car in S.I. units.
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 space craft flying in a straight course with velocity of 75 km s-1 fires its rocket motors for 6.0 s. At the end of this time its speed is 120 km s-1 in the same direction.
Find
(i) The space craft's average acceleration while the motors were firing
(ii) The distance travelled by the space craft in the first 10 s after the rocket motors were started, the motors being in action for only 6 s.
A body falls towards the earth. Does it have positive or negative acceleration?
The distance covered by a body is directly proportional to the square of the time elapsed. What can you say about its acceleration?
What happens to the stepwise increasing speed-time graph when the size of each step is made very small?
Sketch the shape of the velocity-time graph for a body moving with:
Uniform acceleration.
What do you understand about negative acceleration?
Acceleration is defined as the rate of change of ______.
Assertion: A positive acceleration of a body can be associated with the slowing down of the body.
Reason: Acceleration is a vector.
