A body is falling freely under gravity. How much distance it falls during an interval of time between 1st and 2nd seconds of its motion, taking g=10 ?
Correct answer: A. 15 m
- A. 15 m
- B. 20 m
- C. 5 m
- D. 25 m
Explanation
For a body starting from rest, the distance covered in the nth second is s_n = 1/2 g(2n - 1). For the second second, s_2 = 1/2 x 10 m/s² x 3 s = 15 m. The likely error is choosing 20 m by using the total distance after 2 s, rather than the distance covered only between 1 s and 2 s.
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About Acceleration
Acceleration measures the rate at which velocity changes with time, including changes in speed, direction or both. Work includes average and instantaneous acceleration, the relation a = Δv/Δt, uniform acceleration equations, and interpreting velocity time and displacement time graphs, with acceleration carefully distinguished from velocity.
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