Problem 2.86 130 Part A You and your roommate plot to drop water baloons on stud

Question

Problem 2.86 130 Part A You and your roommate plot to drop water baloons on students entering your dorm. Your window is 30 m above the sidewalk. You plan to place an X on the sidewalk to mark the spot a student must be when you drop the balloon. You note that most students approach the dorm at about 3 m/s How far from the impact point do you place the X? Express your answer to one significant figure and include the appropriate units. dValueUnits Submit X Incorrect: Try Again; 4 attempts remaining Return to Assignmen Provide Feedback

Explanation / Answer

Time taken by water balloon to drop from 30 m height-

S = u*t + 0.5*a*t2

30 = 0*t + 0.5*9.8*t2

30 = 4.9*t2

t = 2.47 sec

distance covered by the student in this time-

s = v*t

s = 3*2.47

s = 7.42 m

place X should be 7.42 m far from the point of impact.

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