After the collision, m2 and m1, let it have a velocity v1 prime.

在碰撞之后，的速度为v2，m 2, has, a, velocity, v 2, prime，使m1的速度为v1。

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Then create a blank model, and name it M1.

然后创建一个空白模型，并命名为 M1。

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So too will the planned construction of M1, a new light-rail system that will run in a north-south corridor from the Detroit river to 8 Mile Road.

因此也将计划兴建M1——一个将会贯穿南北，从底特律河到8英里公路的新的轻轨系统。

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They can turn a five-minute ride in a 30-year-old BMW M1 into something more thrilling than an entire day of track driving in a brand new BMW M6.

FORBES: An Unforgettable Ride In A Rare BMW M1 Supercar

Construction work has started to clear the site, just off junction 28 off the M1, a Co-operative spokesman said.

BBC: Co-op building ?22m distribution depot in Derbyshire

Firstly, there was no speed limit on the M1 - drivers could go as fast as their vehicle allowed, and a few enjoyed using the M1 as a racetrack.

BBC: The M1 celebrates its 50th birthday