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A cable is attached to a 5.0 kg box and used to pull the box upwards. What tension force is required to accelerate the box upwards at a rate of 4.0 m/s2?

520 N
480 N
500 N
20 N

Answer :

20 N
We can tell by the equation:
Force = mass × acceleration
So:
F = 5 × 4
F = 20
Correct answer should be 69 N. All your options are wrong.
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