Arock is thrown upward from the level ground in such a way that the maximum height of its flight is equal to its horizontal range r. in terms of the original range rmax, what is the range rmax the rock can attain if it is launched at the same speed but at the optimal angle for maximum range?

Explanation:

If the maximum height attained by the rock is equal to the range of the rock

then we will say

so from this we can say

now original range is given as

now we know that for maximum possible range we need to throw at 45 degree

the answer to your question is high voltage and high currency

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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