A 9-kg sled sliding freely on an icy surface experiences a 3-N frictional force exerted by the ice and an air-resistive force of 0.6 N. a. What is the net force acting on the sled? b. What is the acceleration of
the sled?

An astronaut on the moon throws a baseball upward. the astronaut is 6 ft, 6 in. tall, and the initial velocity of the ball is 3030 ft per sec. the height s of the ball in feet is given by the equation s equals negative 2.7 t squared plus 30 t plus 6.5s=−2.7t2+30t+6.5, where t is the number of seconds after the ball was thrown. complete parts a and b.