After a projectile is fired into the air, what is the magnitude of the acceleration in the y direction? (Assume no air resistance.)
O A. 4.9 m/s?
B. 19.6 m/s2
O C. O m/s2
O D. 9.8 m/s2

If an inclined plane is 5 m long and 2 m high, what is its mechanical advantage? a. 2.5 b. 3 c. 7 d. 10

What is the mass of the same rock on the earth

Agroup of students were investigating the force of gravity. they began by dropping a foam ball from a height of 3 meters into a bucket of sand. the ball hit the sand in 0.306 seconds. they dropped additional balls of approximately the same diameter, but of different masses. here is the data they collected. based on this experiment and the collected data, what would their conclusion be?