Before railroad were invented, goods often traveled along canals, with mules pulling barges from the bank. If a mule is exerting
a 12,000N force for 10km, and the rope connecting the mule to the barge is at a 20 degree angle from the direction of travel, how much work did the mole do on the barge? A. 12MJ
B. 11MJ
C. 4.1MJ
D. 6MJ
Answer: A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s2. A spaceship far from any star or planet accelerates uniformly from 72 m/s to 160 m/s .