A block of mass m=4.50 kg is released from rest from point A and slides on the frictionless track shown in the figure below assume ha = 6.00 m. Determine the block’s speed at points B and C

A) point B _ m/s
point C _ m/s

B) determine the net work done by the gravitational force on the block as it moves to point A to point C

B) _ J

Identify the correct relation showing that the radius r of the orbit of a moon of a given planet can be determined from the radius r of the planet, the acceleration of gravity at the surface of the planet, and the time τ required by the moon to complete one full revolution about the planet. determine the acceleration of gravity at the surface of the planet jupiter knowing that r = 71 492 km and that t= 3.551 days and r= 670.9 × 10^3 km for its moon europa.