A shopper at the local grocery store exerts a net force of 9.8 N on a 4-kg shopping cart for 3.3 seconds. (a) According to Newton's 2nd Law, Σ F = ma, what is the acceleration of the shopping cart? a = ______ m/s2   (b) We learned in our discussion of motion that the acceleration of an object measures how the speed changes with respect to time, a =  vf - vi t Using the acceleration found in part (a), the time given, and the fact that the cart starts from rest (vi = 0 m/s), determine the final speed of the shopping cart. Hint: In the expression for acceleration above, if you multiply both sides of the equation by the time, you can solve for vf. More specifically, a t = vf - vi vf =  ______ m/s.

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!