A man standing at the top of a building kicks a small rock of massm. The height of the building ishand initialvelocity of the rock after the kick is~v =< v,0,0>. Assume no air resistance and let g be the magnitude of the acceleration due to gravity. a. Find the time taken by the rock to hit the ground.
b. How far away from the building did the rock travel before hitting the ground?
c. Determine the magnitude of velocity of the rock before hitting the ground.

Which expression allows you to determine the mechanical advantage of an inclined plane? a. height of plane / input force b. length of plane / input force c. length of plane / height of plane d. height of plane / length of plane

When a light bulb shines, it gives off light energy and energy. a. heat b. potential c. chemical d. electrical

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.