On an icy road, a 1100 kg car moving at 55 km/hstrikes a 450 kg truck moving in

Question

On an icy road, a 1100 kg car moving at 55 km/hstrikes a 450 kg truck moving in the same direction at 25 km/h . The pair is soon hit from behind by a 1500 kg car speeding at 65 km/h , and all three vehicles stick together.

Part A

Find the speed of the wreckage.

On an icy road, a 1100 kg car moving at 55 km/hstrikes a 450 kg truck moving in the same direction at 25 km/h . The pair is soon hit from behind by a 1500 kg car speeding at 65 km/h , and all three vehicles stick together.

Part A

Find the speed of the wreckage.

Explanation / Answer

first find the common velocity for two vehicles

from conservation of momentum

m1u1+m2u2=(m1+m2)v12

v12=12.86 m/sec

now these tow stick together with third car

so v123=m3u3+m12*v12/(m1+m2+m3)

v123=15.414 m/sec

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