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a. What is the maximum speed of the ball as it leaves the gun?

Vf = sqrt (k/m)x Xi = 1.31 m/s

b. If it is shot off (horizontally) a 6 ft high table, how far from the base of the table will it land?

Would I use x = vot + 1/2at2 ??? To find the time and then insert into the problem? I'm confused.

And the second problem....

I dead lift to a height of 30 inches 500lbs and proceed to walk the length of a football field (100 yds) and set the weight back down. Because I'm in great shape, I barely work up a sweat but how much work did I do?

with 30 inches = .762m

m= 500lbs, 2,224 N

x= 100 yds, 91 m

W = F change in X

=2,224Nx(91m) = 202,384J

This seems like an unreasonably high amount of work. I didn't take into consideration lifting the weight because it is perpendicular to the amount of work being done. Only the parallel force matters, right?

Thanks for any and all help.