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[匿名]

2010-01-03 10:28 pm

toy car B is stationary and toy car A is pushed to hit it at 3m/s . During the
collision , toy car B accelerates at 1 m/s^2 for 0.5s on average. toy cars A and B are of mass 3 kg and 1 kg respectively.

更新1:

find the velocity of toy car A after the collision?

回答 (2)

天同

2010-01-03 11:15 pm

✔ 最佳答案

Apply equation of motion on car B: v = u + at
with u = 0 m/s, a = 1 m/s2, t = 0.5s, v = ?
v = 1 x 0.5 m/s = 0.5 m/s

Use conservation of momentum
3 x 3 = 3V(a) + 1 x 0.5
where V(a) is the velocity of car A after the collision
V(a) = [9 - 0.5]/3 m/s = 2.8 m/s

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版主_Yaho_O

2010-01-03 10:34 pm

Car A :10000000 m/s^2

Car B::2000000 m/s^2

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