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Instructions: Show all your work & steps clearly All figures/answers must be expressed in SI Units Try to use the 4 steps of solving questions: Data, Formula, Sketch/Diagram & Free body diagram (if applicable) Explain steps when doing calculation. 8. A 970-kg car starts from rest on a horizontal roadway and accelerates eastward for 5.00 s when it reaches a speed of 25.0 m/s. What is the average force exerted on the car during this time? 9. An object has a kinetic energy of 275 J and a momentum of magnitude 25.0 kg ? m/s. Find the : a. speed and b. mass of the object. 10. A rifle with a weight of 30 N fires a 5.0-g bullet with a speed of 300 m/s. a. Find the recoil speed of the rifle. b. If a 700-N man holds the rifle firmly against his shoulder. Find the recoil speed of the man and rifle
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