A robot is tracking the path of a spaceship. At the instant shown the distance (r) is 15km, and the angle (?) is 30?. From successive measurements are used to estimate the derivatives. ? ,?, ?and ? as 310m/s. 50m/s ² . 0.032 rad/s. and 0.005 rad/s ² , respectively. Determine the velocity and acceleration of the spaceship.

r