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प्रश्न
What term is used to denote the change of velocity with time ?
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उत्तर
Acceleration
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संबंधित प्रश्न
Name the quantity which is measured by the area occupied under the velocity-time graph.
Fill in the following blank with suitable word :
If a body moves with uniform velocity, its acceleration is ..............
Derive the formula : v = u + at, where the symbols have usual meanings.
A bus increases its speed from 36 km/h to 72 km/h in 10 seconds. Its acceleration is :
A bicycle initially moving with a velocity 5.0 m s-1 accelerates for 5 s at a rate of 2 m s-2. What will be its final velocity?
The figure shows the displacement - time graph for four bodies A, B C and D. In each case state what information do you get about the acceleration (zero, positive or negative).
When is the positive acceleration?
Multiple choice Question. Select the correct option.
The speed of a car reduces from 15 m/s to 5 m/s over a displacement of 10 m. The uniform acceleration of the car is :
A packet is dropped from a stationary helicopter, hovering at a height ‘h’ from ground level, reaches the ground in 12s. Calculate
- the value of h
- final velocity of packet on reaching the ground. (Take g = 9.8 ms−2)
An electron moving with a velocity of 5 × 104 ms−1 enters into a uniform electric field and acquires a uniform acceleration of 104 ms–2 in the direction of its initial motion.
(i) Calculate the time in which the electron would acquire a velocity double of its initial velocity.
(ii) How much distance the electron would cover at this time?
