It takes the same time as it did going upwards.
OR you can dwork it out..final position is zero, intial position is zero..
hf=hi+vi*t+ 1/2 g t^2 where g is -9.8m/s^2
solve for t.
An object is thrown vertically upward with a speed of 19.1 m/s. How high does it rise?
I get 1.86e+01 m
How long does it take to reach this highest altitude?
I get 1.95e+00 s
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I am stuck on part c, however, which asks How long does it take the object to hit the ground after it reaches the highest altitude?
1 answer