Mage anderson 1-D Quiz Review ormulas: Constants 8-9.8 m/s- 32 /s Problems: 1. A

Question

Mage anderson 1-D Quiz Review ormulas: Constants 8-9.8 m/s- 32 /s Problems: 1. A boulder falls over a 165 ft dliff. When will it hit the ground and how fast is it falling? 2. A car's velocity increases uniformly from 25 mph to 55 mph while covering a distance of 1.4 miles. Find the acceleration of the truck and the time it takes to reach this velocity 3. A car starts at rest and accelerates at a rate of 2.4 m/s?. Find its final velocity and the distance the car travels after 7.00 seconds. 4. How far and long does a ball fall if it has a final velocity of 46.8 m/s?

Explanation / Answer

Q1.
u = 0
a = 9.8 m/s^2
s = 165 ft = 50.292 m

s = ut + 1/2at^2
=> 50.292 = 0.5*9.8*t^2
=> t = 3.2 s
So it will tae 3.2 s to hit the ground

v = u + at
=> v = 9.8*3.2
=> v = 31.4 m/s

Pls post other ques separately.

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