1) A 4.80-kg watermelon is dropped from rest from the roof of a 22.0-m -tall bui

Question

1) A 4.80-kg watermelon is dropped from rest from the roof of a 22.0-m -tall building and feels no appreciable air resistance. Just before it strikes the ground, what is the watermelon's speed?

2) A physics book slides off a horizontal table top with a speed of 1.30m/s . It strikes the floor after a time of 0.320s . Ignore air resistance.

a) Find the magnitude of the book's velocity just before the book reaches the floor= v=3.39 m/s. I found this but I couldn't do part b:

b)Find the direction of the book's velocity just before the book reaches the floor. Express your answer as an angle measured below the horizontal

Explanation / Answer

1) velocity = sqrt(2h/g) = 2.1189m/s

2) ux = 1.3m/s

uy = 0;

uxt = 1.3

uyt = 9,8t

at t= 0.32sec,

vx =1.3

vy = 9.8*0.32 = 3.136m/s

magnitude = sqrt(vx2+vy2) = 3.39m/s

direction = tan-1(vy/vx) = 67.48399o

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