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प्रश्न
A body falls freely from a certain height. Show graphically the relation between the distance fallen and square of time. How will you determine g from this graph?
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उत्तर
The value of acceleration due to gravity (g) can be obtained by doubling the slope of the S - t2 graph for a freely falling body.
संबंधित प्रश्न
Distinguish between acceleration and retardation.
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 train moving with a velocity of 20 ms−1 is brought to rest by applying brakes in 5 s. Calculate the retardation.
Explain the following concept in your own words with everyday examples:
Acceleration
A racing car is moving with a velocity of 50 m/s. On
applying brakes, it is uniformly retarded and comes to rest in 20 seconds. Calculate its acceleration.
The acceleration of a body is 8.5 ms-2. What does this statement mean?
The speed of a car increases from 10 km/h to 64 km/h in 10 seconds. What will be its acceleration?
What happens to the stepwise increasing speed-time graph when the size of each step is made very small?
A body has an acceleration of -3.5 ms-2. What is its retardation?
Assertion: A positive acceleration of a body can be associated with the slowing down of the body.
Reason: Acceleration is a vector.
