As rod oa rotates, pin p moves along the parabola bcd. the equation of this parabola is r=2b/(1+cosθ) and that θ = kt. identify the correct set of expressions for the velocity and acceleration of p when θ = 0.

Abatter hits a 0.140-kg baseball that was approaching him at 30 m/s and, as a result, the ball leaves the bat at 40 m/s in the reverse of its original direction. the ball remains in contact with the bat for 2.0 ms. what is the magnitude of the average force exerted by the bat on the ball?