1) a) Mr. Knoll took 85,5s to ride up a 455m hill. What was his average speed in m/s? What is the correct number of sigfigs in your answer?

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.

A248-g piece of copper is dropped into 390 ml of water at 22.6 °c. the final temperature of the water was measured as 39.9 °c. calculate the initial temperature of the piece of copper. assume that all heat transfer occurs between the copper and the water. remember, the density of water is 1.0 g/m

Ahot-air balloonist, rising vertically with a constant speed of 5.00 m/s releases a sandbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. compute the velocity of the sandbag at 0.250 s after its release.