ay-g-+9.80 m/s2. The crucial point is that you must decide at the start which di

Question

ay-g-+9.80 m/s2. The crucial point is that you must decide at the start which direction is positive, and then stick with your decision. Practice Problem 2.10 Our first example of free-fall motion is very simple. A 2-euro coin is dropped from the Leaning Tower of Pisa. It starts from rest and falls freely. Ignore the effects of air resistance, and compute its position and velocity after 1.00 s, 2.00 s, and 3.00 s. Part A - Practice Problem The coin is released 46.0 m above the ground. How much time is required for the coin to fall to the ground? Express your answer in seconds to three significant figures. 3.06 I Figure 1 : of 1 Submit My Answer Give Up The Leaning Tower Our sketch for the problem Correct Part B- Practice Problem: What is its velocity just before it strikes the ground? 100s,? Express your answer in meters per seconds to three significant figures. ay 9-980 m/s2 2 200 s, y2? 30 In/s Submit My Answers Give Up 300 s, y,-? Incorrect; Try Again; 17 attempts remaining; no points deducted Check your signs. Continue

Explanation / Answer

part B

initial velocity v0y = 0

acceleration ay = -g = -9.8 m/s^2

time t = 3.06 s

final velocity vy = ?

from equation of motion

vy = voy + ay*t

vy = 0 - 9.8*3.06

vy = -30.0 m/s

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