Due tonight, stuck between b and d Which pair of graphs represent the correct relationship between position x and velocity v of a moving object?
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Well we can't see (B) in your picture, so we can't comment on it.

But ' D ' depicts a correct relationship between a position and a speed.

(And C doesn't.)

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s