answer the following problem with complete solution.

A rock is tossed straight up with a speed of 20 m/s. When it returns, it falls into a hole 10 m deep. a. What is the rock's velocity as it hits the bottom of the hole? b. How long is the rock in the air, from the instant it is released until it is released until it hits the bottom of the hole? 1 Add file 25 points As a science project you drop a watermelon off the top of the Empire State Building, 320 m. about the sidewalk. It so happens that Superman flies by at the instant you release the watermelon. Superman is headed straight down with the speed of 35 m/s. How fast is the watermelon going when it passes Superman? 1 Add fileJennie drives 100 miles to Lalisa's house. On the way to Lalisa's, Jennie dtriv4e half the distance at 40 mph (miles/hour) and half the distance 60 mph. On her return trip, she drives half the time at 40 mph and half the time 60 mph. a. What is Jennie's average speed on the way to Lalisa's house. b. What is her average speed on the return trip? 1 Add file 15 points A Porsche challenges a Honda Civic to a 400 m race. Because the Porsche's acceleration of 3.5 m/s2 is larger than the Honda Civic's 3.0 m/s2, the Honda Civic gets a 50 m head start. Both car start accelerating at the same point. Who wins? 1 Add file25 points Mingyu is driving to the grocery store at 20 m/s. He is 110 m from an intersection when the traffic light turns red. Assume Mingyu's reaction time is 0.50s and that his car brakes with constant acceleration a. How far is Mingyu from the intersection when he begins to apply the brakes? b. What acceleration will bring Mingyu to rest right at the intersection. c. How long does it take Mingyu to stop after the light turns red? 1 Add file