What force should be applied on a 10 kg body so that it moves down in a vacuum with an acceleration of 3 m/s2 ? (Take g=9.8 m/s2)
Correct answer: C. 68 N
- A. 42 N
- B. 46 N
- C. 68 N
- D. 53 N
- E. 58 N
Explanation
The question wants the object to only move down at 3 m/s2, we need to apply an upward force that would accelerate the object downwards at 9.8-3=6.8 m/s2. Using F=ma, where m = 10 kg and a = 6.8 m/s2, we find F to be 68 N upwards.
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