Final answer:
The velocity of a penny at impact after being dropped into a wishing well for 1.50 seconds is approximately 14.7 m/s, calculated using the formula v = g*t, where g is 9.81 m/s^2.
Step-by-step explanation:
A penny dropped into a wishing well reaches the bottom in 1.50 seconds, and the question seeks to determine the velocity at impact. To solve for this, we can use the kinematic equation for uniformly accelerated motion without initial velocity (v = g*t), where g is the acceleration due to gravity (9.81 m/s2) and t is the time in seconds.
Thus, the velocity at impact would be computed as follows:
v = g * t = 9.81 m/s2 * 1.50 s = 14.715 m/s.
When rounding to two significant digits, the velocity is approximately 14.7 m/s.
Given the multiple-choice options, the correct choice is a. 14.7 m/s.