# A ball was dropped from the window of a building, 33.5 meters above the ground How fast it is after 2 seconds? How long will it take if the final velocity is 25 m/s?

A ball was dropped from the window of a building, 33.5 meters above the ground
How fast it is after 2 seconds?
How long will it take if the final velocity is 25 m/s?
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Killaninl2
It is given that A ball was dropped from the window of a building, 33.5 meters above the ground.
We have to solve two subproblems.
-How fast it is after 2 seconds?
-How long will it take if the final velocity is 25 m/s?
Now, to find how fast it is after 2 seconds.
We must use Newton's first law of motion, hence we have
v=u+gt−−−−(1), where t=2 sec, ,initial velocity is u=0 m/sec, we have to find the final velocity v.
So, now we have

hence, after 2 seconds it is fast by 19.6 m/sec
To find how long will it take if the final velocity is 25 m/s.
here, we have to find the time t, we have the final velocity is v=25 m/sec
Since, initial velocity is u=0 m/sec
Again, using Newton's first law of motion, hence we have
v=u+gt−−−−(1), put values in equation(1), so we have

hence, it will take 2.55102040816 seconds to reach at final velocity of 25 m/sec