Gravity acceleration

The acceleration of an object falling freely near the surface of the earth

9.8 m/s^2

11 m/s^2

9 m/s^2

7 m/s^2

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Correct Answer

Explanation

An object falling from a very high platform achieves a speed of ______ by end of second second

20 m/s

19.6 m/s

22 m/s

16 m/s

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Explanation

An object falling from a very high platform achieves a speed of ______ by end of third second

31 m/s

26 m/s

28 m/s

29.4 m/s

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Explanation

What is the speed of an object thrown upward with a starting speed of 29.4 at third second?

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0 m/s

2 m/s

1 m/s

0.5 m/s

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Correct Answer

Explanation

What is the right equation relating acceleration, the distance travelled, and the time of fall is?

Given v₀ is the original speed, t is the time elapsed, and a is gravity acceleration

d = v₀t + ½ at₂
d = v₁t + ⅓ at * 2
d = v₁t + ½ at * 2
d = v₁t + ½ at * 3

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Correct Answer

Explanation

What is the distance covered by an object falling from rest towards ground after 3 seconds?

Hint: use acceleration equation

d = v₀t + ½ at²

44.1 m

44 m

38 m

45 m

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Correct Answer

Explanation

What is the average speed of an object falling towards ground from rest after 4 seconds?

19.1 m/s

19.5 m/s

19.6 m/s

19.4 m/s

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