A young student drops a stone off the side of a cliff that is 41 meters high. How long does it take the stone to hit the ground below? A)
2.89 s

B)
8.36 s

C)
3.20 s

D)
2.04 s

Iwill give 30 points to whoever answers ! what is the formula for actual mechanical advantage and ideal mechanical advantage?

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?