Recent content by lukejian

i got this already, i asked my teacher on MSN to find out.. the solution is actually finding the momentum downwards + upwards. S=1/2at^2 and use V=at. and i got V.

can i please have your msn or some kind of instant tool to communicate?

oh so.. the initial velocity is 9.8, and the final velocity is 0 right? and then the changing velocity is final - initial?

so what's the exact solution? i am confuse... i understand what you are talking about, but how do i calculate the velocity going down?

how can i determine the velocity when it rebounded?

Thanks

dont you see the hook is at the connecting point of 2 ropes? the 2 ropes added up to 500N. but then one rope is longer, and one is shorter, so the force they contain is different too

for A, because it has 2 ropes, and they are not equal , so it's not 500N

i don't get this question, can someone helps me?

Homework Statement A superball with a mass of 83.6 g is dropped from a height of 3.1 m. It rebounds to a height of 2.5 m. The acceleration of gravity is 9.8 m/s2. What is the change in its linear momentum during the collision with the floor? Answer in unit of kg m/s...