Suppose you drop an object from the roof of your house. It takes 2 seconds to reach the ground. What is the height of your house?
Correct answer: B. 20m
- A. 10m
- B. 20m
- C. 5m
- D. Insufficient information
Explanation
The correct answer is 20 according to the given solution For Motion under Gravity. We can use the shortcut or derived a formula for height when the body dropped as H=% gt Where g=10m/s2 and t=2s H=4(10)(2) H=V(10)(4) H=20m
This question appeared on the HEC Phase I 2017 paper, which you can sit online with every answer explained.
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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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