Advertisements
Advertisements
प्रश्न
Can you use the relation [B1]?
Advertisements
उत्तर
No we cannot use this relation for a body moving with uniform 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 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.
When is the acceleration due to gravity positive?
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.
The distance covered by a body is directly proportional to the square of the time elapsed. What can you say about its acceleration?
The graph shows how the velocity of a scooter varies with time in 50 s.
Work out: Deceleration
From the given v-t graph it can be inferred that an object is
A car is being driven at a speed of 20ms-1 when brakes are applied to bring it to rest in 5 s. The deceleration produced in this case will be ______.
The value of acceleration for a body at rest is ______.
Assertion: When a body is subjected to a uniform acceleration, it is always moving in a straight line.
Reason: Motion may be straight-line motion or circular motion.
