Answer:
the answer is B: earth takes to rotate once on its axis
Answer:
V = 3.17 m/s
Explanation:
Given
Mass of the professor m = 85.0 kg
Angle of the ramp θ = 30.0°
Length travelled L = 2.50 m
Force applied F = 600 N
Initial Speed u = 2.00 m/s
Solution
Work = Change in kinetic energy
![F_{net}d = \frac{1}{2}mv^{2} - \frac{1}{2}mu^{2}\\\frac{2F_{net}d }{m} = v^{2} -u^{2}\\ v^{2} =\frac{2F_{net}d }{m} +u^{2}\\ v^{2} =\frac{2(600cos30 - 85\times 9.8 \times sin30) \times 2.5 }{85} +2.00^{2}\\ v^{2} = 10.066\\v = 3..17m/s](https://tex.z-dn.net/?f=F_%7Bnet%7Dd%20%3D%20%5Cfrac%7B1%7D%7B2%7Dmv%5E%7B2%7D%20-%20%5Cfrac%7B1%7D%7B2%7Dmu%5E%7B2%7D%5C%5C%5Cfrac%7B2F_%7Bnet%7Dd%20%7D%7Bm%7D%20%3D%20v%5E%7B2%7D%20-u%5E%7B2%7D%5C%5C%20v%5E%7B2%7D%20%3D%5Cfrac%7B2F_%7Bnet%7Dd%20%7D%7Bm%7D%20%2Bu%5E%7B2%7D%5C%5C%20v%5E%7B2%7D%20%3D%5Cfrac%7B2%28600cos30%20-%2085%5Ctimes%209.8%20%5Ctimes%20sin30%29%20%5Ctimes%202.5%20%7D%7B85%7D%20%2B2.00%5E%7B2%7D%5C%5C%20v%5E%7B2%7D%20%3D%2010.066%5C%5Cv%20%3D%203..17m%2Fs)