A block of mass = 4.00 kg is supported by a spring scale with unit of measure of Newtons. This spring scale is attached to top of an elevator. The elevator accelerates upward with a = 3.00 m/sec2. What is the reading on the spring scale to 3 significant figures?

118 N

Explanation:

Given mass of the block, m = 4.00kg.

The acceleration of the elevator, a = 3.0 m/s^2.

As elevotar attaced with spring scale and accelerating upward

(block and elevator), so total force

Here, mg is the weight of the block downward direction.

or

substitute the given value, we get

     = 117.6 N = 118 N.

Thus, the reading on the spring scale to 3 significant figures is 118 N.

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explanation: