Please answer and show work on the following physics problems. Quantitative Prel

Question

Please answer and show work on the following physics problems.

Quantitative Prelecture Video: Impulse and Momentum Part A A 700-kg car, driving at 29 m/s, hits a brick wall and rebounds with a speed of 4.5 m/s. What is the car's change in momentum due to this collision? Click Play to watch the video below. Answer the ungraded questions in the video and the graded follow-up questions at right. ( O O 2.3x 104 kg·m/s towards the wall 2.3x 104 kg·m/s away from the wall 1.7 x 104 kg·m/s away from the wall 1.7 x 104 kg·m/s towards the wall Impulse .f..t 3 m/s 2 m/s Submit My Answers Give Up Part B A 700-kg car, driving at 29 m/s, hits a brick wall and rebounds with a speed of 4.5 m/s. If the car was in contact with the wall for 0.30 s, what force did the wall exert on the car during the collision? 0 1.1 x 104 N 5.7x104N 7.8x 104 N 6.8 x 104N

Explanation / Answer

(A) change in momentum = m (vf - v0)

= 700 (4.5 - (-29))

= 23450 kg m/s

= 2.3 x 10^4 kg m/s away from the wall

(B) change in momentum = F t

2.3 x 10^4 = F(0.30)

F = 7.8 x 10^4 N

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impulse = area under the F vs t curve

= 2.2 x 1.2 / 2

= 1.3 kN-s

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