Campus Maths Puzzle Category

How can you throw a ball as hard as you can and have if come back to you, even if doesn't bounce off anything ? there is nothing attached to it,and no one else catches or throws if back to you..

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Campus Other Question

For what value of “k” will the equation (2kx2 + 5kx +2)=0 have equal roots?
A. 2/7 B. 9/4 C. 16/25 D. 7/1
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(0.04)-2.5 = ?
options-
A. 3125
B. 25
C. 125
D. 625