If a motorist averages 65 km/h and drives for 9 hours/day, how many days will be needed to cover the 3700 km distance by road from Chicago to San Francisco? A car moving at 80 km/h is brought to a stop in 3 s. What is its average acceleration (in m/s 2) in this period? A force of 20-N acts on a body at rest on a table. The body's weight is 8 N. What is the body's mass? What is its acceleration? An arrow is shot vertically upward with an initial velocity of 80 ft/s. a) How long will it rise? b) How high will it rise? c) What are its position and velocity after 2 s? d) What are its position and velocity after 6 s? An airplane is in level flight at a speed of 200 m/s and an altitude of 2400 m when a windshield wiper falls off. What will the wiper's speed be when it reaches the ground? May need to use vector addition. A parachutist whose total mass is 100 kg is falling at 50 m's when her parachute opens. Her speed drops to 8 m's in 3 s. What is the total force her harness had to withstand? How many times her weight is this force? The 200-g head of a golf club moves at 40 m's in a circular arc of 1.2 m radius. How much force must the player exert on the handle of the club to prevent it from flying out of her hands at the bottom of the swing?A bull and a cow elephant, each of mass 2000 kg, attract each other. Gravitationally with a force of 2 x 10 N. How far apart are they