PH-90

Resultant force and F = ma

Physics · Secondary 3 · Hard · Resultant force and F = ma

A 600 N student stands on a lift that is moving upwards and slowing down.
The upward force from the floor on the student is 540 N.

What is the direction of the student’s acceleration and its size? (Take

g = 10\,\text{m s}^{-2}

1.0 m s $^{-2}$ upward
1.0 m s $^{-2}$ downward
10 m s $^{-2}$ upward
10 m s $^{-2}$ downward

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