Question

How would one calculate the speed of a ball being swung in vertical circles, when it is 30 degrees below the horizontal? (mass, speed at top of swing, radius of string, height of the centre of the circle are given)

Answer 1

ugh... no hope. haha

Answer 2

conservation of energy
potential energy + kinetic energy is constant

Answer 3

speed at top of swing + mg(2R) = speed at the point(unknown) + mg (R sin30)

Answer 4

u'll get the answer with that

Answer 5

thank you thank you!

Answer 6

welcome :)