Posted by **Hannah** on Sunday, June 3, 2012 at 1:34pm.

1) David has a mass of 86.4-kg and is skating with in-line skates. He sees his 24.8-kg younger brother up ahead standing on the sidewalk, with his back turned. Coming up from behind, he grabs his brother and rolls off at a speed of 2.99 m/s. Ignoring friction, find david's speed just before he grabbed his brother.

I do not know how to start this.

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