Question

A 1200 kg car moving at 2.5 m/s is struck in the rear by a 2600 kg truck moving at 6.2 m/s. If the vehicles stick together after the collision, what is their speed immediately after colliding?

Velocity: m/s

Answer 1

Answer: 5.0 m/s

Explanation:i had this question on my test

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Answer 2

Conservation of linear momentum

$\\ \rm\Rrightarrow m1v1+m2v2=(m1+M2)v3$

$\\ \rm\Rrightarrow 1200(2.5)+2600(6.2)=(1200+2600)V3$

$\\ \rm\Rrightarrow 3000+16120=3800v3$

$\\ \rm\Rrightarrow 19120=3800v3$

$\\ \rm\Rrightarrow V3=5m/s$(Approx)