Question

A juggler tosses a 0.4kg ball straight up at 8m/s, and then catches it at the same height .

a. determine the acceleration on the way up and down
b. determine the total amount of time spent in the air by the ball. (hint: you know the displacement)
c.determine the velocity of the ball just as the juggle catches it. (Hint: it is not zero)

Answer 1

where is the displacement ?

Answer 2

I was confused there too cause the problem didn't tell me the displacement so I don't know how to find acceleration.

Answer 3

I finally decided one was supposed to use -9.8m/s^2

Answer 4

a. g=9.8 m/s²
b. Upward:
v=v₀-gt
v=0 => t=v₀/g =8/9.8 =0.82 s.
t(up) =t(down)
t(total)=2•0.82=1.64 s.
c. v=v₀=8 m/s