Two boats start together and race across a 80-km-wide lake and back. Boat A goes across at 80 km/h and returns at 80 km/h. Boat B goes across at 40 km/h, and its crew, realizing how far behind it is getting, returns at 120 km/h. Turnaround times are negligible, and the boat that completes the round trip first wins. a. Which boat knows?
b. By how much?

answer: the answer is a

massxgravity x heght=weightxheight= pe

4900=490xh

h=10

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

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