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JAMB Physics 2016 Paper

Question : 20

Total: 48

[g = 10ms^-2

Solution:

Concept:

To accelerate a mass vertically upward, the applied force must overcome its weight and also provide the net upward force for the acceleration.

Explanation:

The net upward force is given by

F - mg = ma

Here,

m = 60\ \mathrm{kg}

a = 10\ \mathrm{m\,s^{-2}}

, and

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

So the required applied force is:

F = m(g + a) = 60(10 + 10) = 60 \times 20 = 1200\ \mathrm{N}

Therefore, the force needed is

1200\ \mathrm{N}

upward.

Answer:

1200\ \mathrm{N}

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