If a penny is dropped from rest from a building takes 2 seconds to hit the ground, calculate the velocity of the penny right before it touches the ground? a. 19.6 m/s
b 9.8 m/s
c. 0 m/s
d 29.4 m/s

Let f(x) = x4- 8x2 . find the relativeextrema of this function using the second derivative test.

If anyone who can me with this hw? i would really appreciate it

A10-kg piece of aluminum sits at the bottom of a lake, right next to a 10-kg piece of lead, which is much denser than aluminum. which one has the greater buoyant force on it? explain. b - the aluminum a) both have the same buoyant force. b) the aluminum c) the lead d) it cannot be determined without knowing their volumes.