An 80-Kg Block Is Released from Rest, with V1 = 0

question 52

Multiple Choice

An 8.0-kg block is released from rest, with v1 = 0.00 m/s, on a rough incline, as shown in the figure. The block moves a distance of 1.6-m down the incline, in a time interval of 0.80 s, and acquires a velocity of v2 = 4.0 m/s. How much work does gravity do on the block during this process?

• A) +81 J
• B) +100 J
• C) +120 J
• D) -81 J
• E) -100 J

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