Answer:
The answer would be A. The waves that heat a cup of water in a microwave oven
B 0.4 m should be correct if not it is A
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hope this helps
Using the formula F = m*a. where F is the force, m is the mass and a is the acceleration you can use it for each. As long as there are no other forces towards the body in both cases :
F = m*a
F = 50*3
F = 150 N