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a) i said that the tension in the string is the same as mg

so T = mg

T = (2kg)(9.8m/s^2)

T = 19.6 N

the back of the book says the answer is 39.2 N, which is double mine. The teacher said something about conservation of energy but i still cant figure out where that factor of two comes in :(

i know how to do b) and c), but they depend on a) so of course they come out wrong too. :(