..ooo H20 6:55 PM 97% edugen.wileyplus.com leyPLUS General Physics 3 (PMYS 111 g

Question

..ooo H20 6:55 PM 97% edugen.wileyplus.com leyPLUS General Physics 3 (PMYS 111 gnment > Open Assignment Chapter 09, Problem 010 A 2050 kg automobile is at rest at a traftic signal. At the instant the light turns green, the automobile starts to move with a constant accelenation of 4.0 m/s, At the same instant a 2350 kg truck, traveling at a constant speed of 9.4 m/s, overtakes and passes the automobile. (a) How far is the center ofl mass of the automobile truck system from the traffic light at t 3.8 s (b) What is the speed of the center of mass of the automobile- e Site

Explanation / Answer

10) The car is located at
.5*4*3.8^2
28.8 m from the light

The truck is located at
9.4*3.8

35.7 m from the light

so 33.5 m where the center of mass is

proof
(1050*28.8+2350*35.7)/(1050+2350)

33.5 m

the speed is related to momentum
the car has speed of
4*3.8=15.2 m/s
the truck is constant at 9.4 m/s

(1050*15.2+2350*9.4)/(1050+2350)
27.17 m/s

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