The linear density of a rod of length 4 m is given by rho(x) measured in kilograms per meter, where x is measured in meters from one end of the rod. rho(x) = 10 + 2 sqrt(x) find the total mass m of the rod.

Abaseball is thrown from the outfield toward the catcher. when the ball reaches its highest point, which statement is true? (a)its velocity is not zero, but its acceleration is zero. (b) its velocity and its acceleration are both zero. (c) its velocity is perpendicular to its acceleration. (d) its acceleration depends on the angle at which the ball was thrown. (e) none of the above statements are true.