1. A ball is dropped from the top of a 83-m-high building. What speed does the b

Question

1. A ball is dropped from the top of a 83-m-high building. What speed does the ball have in falling 3.1 s?

__________ m/s

2. The Hoover Dam Bridge over the Colorado River at a height of 271 m. If a heavy object is dropped from the bridge, how much time passes before the object makes a splash? (Neglect air resistance.)

__________ s

3.If you drop an object from a height of 1.9 m, it will hit the ground in 0.62 s. If you throw a baseball horizontally with an initial speed of 43 m/s from the same height, how long will it take the ball to hit the ground?

__________ s

4. A golfer on a level fairway hits a ball at an angle of 31° to the horizontal that travels 111 yd before striking the ground. He then hits another ball from the same spot with the same speed, but at a different angle. This ball also travels 111 yd. At what angle was the second ball hit? (Neglect air resistance.)

__________ °

Could you guys please show me the equations to let me know how to solve. Thank you.

Explanation / Answer

a) Here since ball start from rest Vi=0 m/s

Use equation Vf = Vi +a*t

b) Use equation,   d= Vi*t +1/2*a*t^2      where Vi=0m/s and d is negative

Solve for t.

c) Time requited to fall the ball from height d=1.9m,

d= Vi*t +1/2*a*t^2      ------------------(1)

Calculate‘t’ to use in next equation.

X = Vix*t --------------(2)

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