A car rear-ends and sticks to a truck, and this question concerns their speeds just before...

Question

Question

science physics

Answer 1

Answer #1

car

m1 = 1000 kg u1 = 20 m/s

truck

m2 = 3000 kg u2 = 5 m/s

after collision

v1 = v2 = V

momentum before collision

Pi = m1*u1 + m2*u2

momentum afteer collision

Pf = (m1+m2)*v

from momentum conservation

Pf = Pi

v = ((1000*20)+(3000*5))/(1000+3000)

v = 8.75 m/s

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Answer 2

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