M1*V1 + M2*V2 = M1*V + M2*V.
2864*V1 + 856*0 = 2864*7.5 + 856*7.5.
V1 = ?
A(n) 2864 kg van runs into the back of a(n)
856 kg compact car at rest. They move of together at 7.5 m/s. Assuming no friction
with the ground, find the initial speed of the
van.
Answer in units of m/s.
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