Astudent pushes a box to slide it across the floor. which statement explains why the box begins to move? a. the weight of the box is greater than the force of friction. b. the weight of the box is less than the force of friction. c. the applied force is greater than the force of friction. d. the applied force is less than the force of friction.

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s