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40. A construction worker accidentally drops a brick from a high scaffold. a.What is the velocity of the brick after 4.0 s? b. How far does the brick fall during this time? 41. Suppose for the previous problem you choose your coordinate system so that the opposite direction is positive. a.What is the brick's velocity after 4.0 s? b.How far does the brick fall during this time? 42A student drops a ball from a window 3.5 m above the sidewalk. How fast is it moving when it hits the sidewalk? 43.A tennis ball is thrown straight up with an initial speed of 22.5 m/s. It is caught at the same distance above the ground. a.How high does the ball rise? b.How long does the ball remain in the air? Hint: The time it takes the ball to rise equals the time it takes to fall. 44. You decide to flip a coin to determine whether to do your physics or English homework first. The coin is flipped straight up. a.What are the velocity and acceleration of the coin at the top of its trajectory? b.lf the coin reaches a high point of 0.25 m above where you released it, what was its initial speed? c.|f you catch it at the same height as you released itr how much time was it in the air