Question

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1. an object of mass 5.0 kg is lifted vertically upward by 2.0 m. assuming the acceleration due to gravity is 9.8 m/s², how much work is done against gravity?

a. 10 j b. 20 j
c. 49 j d. 98 j

Explanation:

Step1: Calculate gravitational force

$F = m \times g = 5.0\ \text{kg} \times 9.8\ \text{m/s}^2 = 49\ \text{N}$

Step2: Calculate work against gravity

$W = F \times d = 49\ \text{N} \times 2.0\ \text{m} = 98\ \text{J}$

Answer:

D. 98 J