The work W (in joules) done when lifting an object varies jointly with the mass m (in kilograms) of the object and the height h (in meters) that the object is lifted. The work done when a 120-kilogram object is lifted 1.8 meters is 2116.8 joules. How much work is done when lifting a 200-kilogram object 1.5 meters?
?
A. 2960 J
B. 2920 J
C. 2940 J
D. 2950 J
E. 2930 J
Answer: C
Mathematics
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. After how many seconds is the velocity 50 ft/s?
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