Question

# A car (open at the top) of mass 9.75 kg is coasting along a level track at 1.36 m/s, when it begins to rain hard. The raindrops fall vertically with respect to the ground. When it has collected 0.5 kg of rain, the speed of the car is

A
0.68 m/s
B
1.29 m/s
C
2.48 m/s
D
9.8 m/s
Solution
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#### Initial m1=9.75 kgfinal m=9.75+0.5=10.25m1v1=m2v2(9.75)(1.36)=(10.25)v2v2=1.29 m/s

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