Advertisements
Advertisements
प्रश्न
The distance covered by a body is directly proportional to the square of the time elapsed. What can you say about its acceleration?
उत्तर
This means the body has a positive acceleration.
APPEARS IN
संबंधित प्रश्न
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 cyclist driving at 36 kmh−1 stops his motion in 2 s, by the application of brakes. Calculate
- retardation
- distance covered during the application of brakes.
Write the SI unit of retardation.
Is it possible for an accelerating body to have constant speed?
A car accelerates uniformly from a velocity of 18 km/h to 36 km/h in 15 min. What is its acceleration?
Correct your friend who says that acceleration gives the idea of how fast the position changes.
If the velocity of a body does not change, then its acceleration is ______.
A bus accelerating with 4ms-2 changes its speed from 60ms_1 to a certain value in 5s. The final speed is ______.
A boy throws a ball up and catches it when the ball falls back. In which part of the motion the ball is accelerating?
An object can be moving with uniform speed but with variable acceleration.