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

question 6

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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