An object with a mass m= 250 g is on a plane inclined at 30 degreesabove the horizontal and is attached by a string to a mass m = 150g. there is no friction and mass m hangs freely and isinitially at rest. when mass m has descended a distance h = 10 cm, its speed will be
(a) 35.0 cm/s
(b) 7.0 cm/s
(c) 140 cm/s
(d) 110cm/s
(e) 70.0 cm/s

a) v = 35 cm/s

Explanation:

Here the work done by gravity on two masses is equal to the change in kinetic energy of the two masses

so here in m = 150 g mass moves down then other mass M = 250 g will move up by same distance on inclined plane

so we have

here we know that

so we will have

if you already have the answer to (a), then just work out how many periods there are in 1 minute, and that's the answer to (c).