A 2.0 kg block is lifted 5.0 m. What is the work done?

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Multiple Choice

A 2.0 kg block is lifted 5.0 m. What is the work done?

Work done against gravity equals the gain in gravitational potential energy, so W = m g h. With m = 2.0 kg, g ≈ 9.8 m/s^2, and h = 5.0 m, W = 2.0 × 9.8 × 5.0 = 98 J. This is the energy transferred to raise the block (assuming no friction). If you round g to 10, you’d get 100 J, which explains nearby options, but the precise value with 9.8 is 98 J.

Work done against gravity equals the gain in gravitational potential energy, so W = m g h. With m = 2.0 kg, g ≈ 9.8 m/s^2, and h = 5.0 m, W = 2.0 × 9.8 × 5.0 = 98 J. This is the energy transferred to raise the block (assuming no friction). If you round g to 10, you’d get 100 J, which explains nearby options, but the precise value with 9.8 is 98 J.

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