Q4. [4 pts] A kid throws a ball vertically upward, and we measure that it reache
ID: 1659071 • Letter: Q
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Q4. [4 pts] A kid throws a ball vertically upward, and we measure that it reaches a maximum height of 10 m. A professional pitcher tries the same thing, and the ball leaves his hand at twice the speed of the kid's throw. How high does the ball go? (you may neglect the effect of air resistance) A] 40 m [B] 20 m [C 10 m [D] 80 m [E] 42 m Q5. [4 pts] A ball dropped from a height of 9.0 m above the ground takes a certain time, t, to reach the ground. How long would a ball dropped from a height of 1.0 m take to reach the ground? (you may neglect the effect of air resistance) AJ t/81 [Bt/9 C I] El9t F] None of these 96. [4 pts] A driver applies the brakes on his car reducing its speed from 41.0 m/s to 11.0 m/s in a time 5.0 secs while traveling a distance of 121 m. What is the magnitude of the car's average acceleration during the 5.0 sec period? A] 8.2 m/s2 B] 8.2 m/s [C] 24.2 m/s D 6.0 m/s Q7. [5 pts] A ladder of length 4.00 m is leaned against a vertical wall. The ladder makes an angle of 60.0 degrees to the horizontal floor. How far from the wall does the ladder touch the ground? A] 3.46 m [B] 0.50 m [C] 4.62 m [D] 2.00 m [E] None of these C1462 m (D] 2.00 m ENone of these 08. If the distance d (in meters) traveled by an object in timet (in seconds) is given by the formula d A+Bt+Ct, then:Explanation / Answer
4. h = v^2 / 2 g
h / 10 = (2v / v)^2 = 4
h = 40 m Ans(A)
5. t = sqrt(2h/g)
t'/t = sqrt(1/9)
t' = t/3 Ans(C)
6. vf = v0 + a t
41 = 11 + 5 a
a = 6 m/s^2 Ans(D)
7. cos60 = d / 4
d = 4 cos60 = 2 m Ans(D)
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