Egyptian Pyramid Workers Push a 1200-Kg Block Up an Incline $\times$

Multiple Choice

Egyptian pyramid workers push a 1200-kg block up an incline that has an angle of 69 degrees to the vertical,at a constant speed of 0.5 m/s.The coefficient of kinetic friction between the block and the incline surface is 0.44.How much power must the workers supply?

A) 3.1 $\times$ 10² W
B) 9.3 kW
C) 4.5 kW
D) 7.9 kW
E) 2.4 kW