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प्रश्न
Out of energy and acceleration, which one is a vector?
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उत्तर
Acceleration is a vector quantity.
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संबंधित प्रश्न
Give one example of the following motion:
Uniform retardation
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 motorbike, initially at rest, picks up a velocity of 72 kmh−1 over a distance of 40 m. Calculate
- acceleration
- time in which it picks up above velocity.
A car traveling at 60 km/h, stops on applying brakes in 10 seconds. What is its acceleration?
Is it possible for an accelerating body to have constant speed?
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?
Exercise Problem.
A racing car has a uniform acceleration of 4 ms–2. What distance it covers in 10 s after the start?
