Question #43 from the PS section:
The sled and the ride start from a location on the hill that is 10m lower than Point A [point A = 20m from ground]. How does the speed of the sled and the rider at point B [the bottom of the hill], starting from this location, compare to the speed of the sled and rider at point B when starting from the top of the hill?
a) It is lower by a factor of 4
b) It is lower by a factor of 2* sqrt(2)
c) It is lower by a factor of 2
d) It is lower by a factor of sqrt(2)
The answer is D. Why isn't A the correct answer? My reasoning is that V^2 = 2gh, so if h is reduced by a factor of 2, V should be reduced by a factor of 4. I don't understand their explanation.
The sled and the ride start from a location on the hill that is 10m lower than Point A [point A = 20m from ground]. How does the speed of the sled and the rider at point B [the bottom of the hill], starting from this location, compare to the speed of the sled and rider at point B when starting from the top of the hill?
a) It is lower by a factor of 4
b) It is lower by a factor of 2* sqrt(2)
c) It is lower by a factor of 2
d) It is lower by a factor of sqrt(2)
The answer is D. Why isn't A the correct answer? My reasoning is that V^2 = 2gh, so if h is reduced by a factor of 2, V should be reduced by a factor of 4. I don't understand their explanation.
