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Answer:
if we use gravity that is 9.8m/s then we get the answer 4.42 seconds
Explanation:
lets do it steps by steps, s=u/t +1/2 at square
100=0+1/2×9.8 time square
100=4.9 time square
100/4.9= time square
t= 10×2.21. as sides changed the signs also changed
t=4.42
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Answer:
The average velocity of the entire trip is 42.5 mph east ⇒ answer C
Explanation:
The average velocity of an object is its total displacement divided by
the total time taken.
It is the rate at which an object changes its position from one
place to another.
It is a Vector quantity
A car travels 25.0 miles due east for one hour
Then it travels another 60.0 miles east for an additional hour
We need to find his average velocity of the entire trip
He is travels due east in the whole trip
The total displacement that he travels = 25 + 60 = 85 miles east
He travels the first part in 1 hour and the second part in another hour
The total time for the whole trip = 1 + 1 = 2 hours
The average velocity = total displacement ÷ total time
His average velocity = 85 ÷ 2 = 42.5 miles/hour east
<em>The average velocity of the entire trip is 42.5 mph east</em>