0 webassign.net Phy 1010-Ch 6 Hom- w18 The change in momentum is greater in the

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0 webassign.net Phy 1010-Ch 6 Hom- w18 The change in momentum is greater in the head-on collision. PRACTICE IT Use the worked example above to help you solve this problem. In a crash test, a car of mass 1.42 x 103 kg collides with a wall and rebounds as shown in the figure. The initial and final velocities of the car are v - -14.3 m/s and vy- 2.66 m/s, respectively. If the collision lasts for 0.155 s, find the following (a) the impulse delivered to the car due to the collision kg m/s (b) the size of and direction of the average force exerted on the car (Indicate the direction with the sign of your answer.) EXERCISE HINTS: GETTING STARTED 1 PM STUCKI Use the values from PRACTICE IT to help you work this exercise. Suppose the car doesn't rebound off the wall, but the time interval of the collision remains at 0.155 s. In this case, the final velocity of the car is zero. Find the average force exerted on the car. (Indicate the direction with the sign of your answer.) Need Help? Talkto Tutor -/9.09 points SerCP96AE 005 EXAMPLE 6.5 The Ballistic Pendulum 20 3 4

Explanation / Answer

a) impulse = change in momentum = m(vf - vi) = 1420 x (2.66 - (-14.3)) = 24083.2 kg m/s

b) Force = impulse/time = 24083.2/0.155 = 155375.5 N

Exercise, Force = (0 - 1420 x (-14.3))/0.155 = 131006.45 N

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