S 10/10) 100 15 =50 . . d (m) 2 2 5. A person pushes with 75 N on a lawnmower where the handle makes an angle of 20 with the horizontal and that has a mass of 25 kg. The surface has u = 0.21 and is 30 m in length. The mower starts at rest. Find the final speed of the lawnmower. (5.7 m/s)4. A girl pulls a 5.0 kg wagon with a force of 20. N for 7.0 m. If the final speed of the wagon is 3.5 m/s, determine the efficiency of this process. 22 5. The graph shows the kinetic energy of a car as the 200 driver steps on the gas pedal. a) What is the power output of the car? 3300W 150 If the process is 30% efficient, determine the - Ex( K J ) power delivered to the car. 11 , DOO W 50 O 10 20 30 40 50 60 TIME (S) 6. The graph shows the power input for a 2.0 kg remote- controlled car starting from rest. 20 a) Determine the energy input. 350 J b) What is the final speed of the car if the remote- 15 controlled car is 20% efficient? ) 3Com 10 POWER ( W ) S 5 O 5 10 15 20 25 30 TIME (S)