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 Form 3 Physics Newton's laws of motion questions and answers

A girl of mass 50 kg stands inside a lift which is accelerated upwards at a rate of 2 m/#s^2#. Determine the reaction of the lift at the girls’ feet.

 (2m 21s)
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Answer Text:
Let the reaction at the girls’ feet be ‘R’ and the weight ‘W’
The resultant force F= R-W
= (R-500) N
Using F = ma, then R-
#500= 50times2#, R= 100+500 = 600 N.