An object with a mass m = 250 g is on a plane inclined at 30^o above the horizontal and is attached by a string to a mass m = 150 g. There is no friction and mass m hangs freely and is initially at rest. When mass m has descended a distance h = 10 cm, its speed will be A) 35.0 cm/s. B) 7.00 cm/s. C) 140 cm/s. D) 110 cm/s. E) 70.0 cm/s.

Question

Quizplus · Accepted Answer

The correct answer is A because the potential energy lost by the hanging mass is equal to the kinetic energy gained by both masses.

An Object with a Mass M = 250 G Is