1. A 74 kg sprinter starts a race with an acceleration of 1.4 m/s^2. If the sprinter accelerates at that rate for 39 m, and then they change the velocity for the remainder of the 100 m dash, what will be his time (in seconds) for the race? 2. An object of mass .77 kg is initially at rest. When a force acts on it for 2.9 ms it requires a speed of 16.9 m/s. Find the magnitude ( in N) of the average force acting on the object during the 2.9 ms time interval. 3. The power from motorcycle can produce an acceleration of 4.5 m/s^2 while traveling at 90 km/h. At that speed the force is resisting motion, including friction in air resistance, total 375 N. (Air resistance is the analogous to air friction. It always opposes the motion of an object) What is the magnitude (in N) of the force, the motorcycle exerts backwards on the ground to produce its acceleration if the mass of the motorcycle with writer is 250 kg. 4. A skydiver weighing 965 N open his parachute at the appropriate height from the ground. The air exerts, a significant upper drive force, which is initially greater than the weight of the diver. This helps to slow the skydiver down. What is the divers acceleration (magnitude in m/s^2) if the magnitude of the drag force is 1135 N? 5. An object of mass 18 kg subjected to a nonzero net force moves with an acceleration of 2.7 m/s^2. A. Determine the net force (in N) acting on it. (Magnitude only) B. What acceleration (in m/s^2) would a 36 kg object have is the same net force is applied? 6. an astronaut weigh 227 pounds on earth is on a mission to the moon and mars. A. What would he weight in newtons when he is on the moon? The acceleration due to gravity on the moon is one sixth that on earth. B. how much would he weigh in newtons when he is on Mars, where the acceleration due to gravity is .38 times that on earth? C. What is his mass in kilograms on earth