Two physics students were discussing a problem in which the class was asked to find the acceleration of a cart rolling up and down an incline at the instant the cart was at the very top of its path. malia says, "at the top the velocity has to be zero so the acceleration has to be zero too." sasha disagrees saying, "no, the velocity is changing at the top so the acceleration can’t be zero." who do you agree with? discuss the reason for your answer and explain why the one who is wrong might legitimately be confused about which answer is correct. note: this is an essay question. your answer will be judged not solely on its correctness, but for its depth, coherence, and clarity.

Greg drew a diagram to compare two of the fundamental forces. which labels belong in the areas marked x, y and z? gravitational force electromagnetic force x. attractive y repulsive z: infinite range x: infinite range y attractive z. repulsive x. always attractive y: infinite range z: attractive or repulsive x. attractive or repulsive y infinite range z: always attractive

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.

Clara is shopping in a grocery store with her friend. each has their own shopping cart in which they want to place their items. the shopping carts are identical. clara and her friend add the same type and number of items to each of their carts. in the baking aisle, however, clara adds 20 pounds of sugar to her own cart, and her friend adds only 10 pounds of sugar to her own cart. which of the following statements best explains what clara must do to accelerate at the same rate as her friend? a. she must add more sugar to her cart. b. she must apply more force to move her cart. c. she must add 20 pounds of salt instead of 20 pounds of sugar to her cart. d. she must apply less force to move her cart.