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.)

__________ °

Explanation / Answer

1)

here , height of building , h = 83 m

time , t = 3.1 s

acceleration , a = 9.8 m/s^2

let the speed is v

using first equation of motion

v = u + g * t

v = 0 + 9.8 * 3.1

v = 30.4 m/s

the speed of the ball after falling for 3.1 s is 30.4 m/s

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