3. an object of mass $5.0\\ \\text{kg}$ is lifted vertically upward by $2.0\\ \\text{m}$. assuming the…

3. an object of mass $5.0\\ \\text{kg}$ is lifted vertically upward by $2.0\\ \\text{m}$. assuming the acceleration due to gravity is $9.8\\ \\text{m/s}^2$, how much work is done against gravity?\na. 10 j\nb. 20 j\nc. 49 j\nd. 98 j

3. an object of mass $5.0\\ \\text{kg}$ is lifted vertically upward by $2.0\\ \\text{m}$. assuming the acceleration due to gravity is $9.8\\ \\text{m/s}^2$, how much work is done against gravity?\na. 10 j\nb. 20 j\nc. 49 j\nd. 98 j

Answer

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