Physics Review Question Unit: Mechanics Year: 1997 Question#: 12 Question: What is the magnitude of net force acting on a 2.0 x 103 kilogram car as it accelerates from rest to a speed of 15 meters per second in 5 seconds? (1 ) 6.0 x 103 N (2 ) 2.0 x 104 N (3 ) 3.0 x 104 N (4 ) 6.0 x 104 N What is this question really asking? Explanation by: Eric D [ Return to question menu ] Answer 1 6.0 x 103 N CORRECT Nice use of Fnet = ma and  or better yet  return to top Answer 2 2.0 x 104 inCORRECT Try using Fnet = ma and  or better yet  return to top Answer 3 3.0 x 104 INCORRECT Try using Fnet = ma and  or better yet  return to top Answer 4 6.0 x 104 INCORRECT close but you have the wrong exponent you need to go back and see where the 10 to the 4th came from. Try using Fnet = ma and  or better yet  return to top What's this question really asking? Do you understand that Impulse (Ft) equals the change in momentum ()? return to top
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