Question:

# free fall?

A crane, moving at the steady velocity of 5 m/s, is lifting a load of bricks when one brick falls off 6 m above the groundDescribe the motion of the free brick by sketching x vst with the ground as the reference point(a) What is the greatest height the brick reaches? (b) How long does it take to reach the ground? (c) What is its speed just before it hits the ground?-so confused by this stuff.

## Answer:

I think that they mean that the crane is lifting the bricks with a velocity of 5 m/s, not that the crane itself is movingThe moment the brick falls off it has a velocity of 5 m/s upward(a) Use energy conservation or the fact that the velocity at the heighest point is zero(b) x(t) x(0) + v(0)t + 1/2at^2 Solve for t(c) v(t) v(0) + at
I think that they mean that the crane is lifting the bricks with a velocity of 5 m/s, not that the crane itself is movingThe moment the brick falls off it has a velocity of 5 m/s upward(a) Use energy conservation or the fact that the velocity at the heighest point is zero(b) x(t) x(0) + v(0)t + 1/2at^2 Solve for t(c) v(t) v(0) + at

Share to: