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Astronauts have connected a line between their 3280 kg space tug and a 6100 kg asteroid.

Using their ship's engine, they pull on the asteroid with a force of 490 N. Initially the tug and the asteroid are at rest, 490 m apart.

How much time does it take for the ship and the asteroid to meet?

-490N 490N

Tug(3280kg)-------><------Asteroid(6100kg)

490m

So Acceleration = Force/Mass

Acceleration for the asteroid is 490/6100 = .0803 m/s2

Acceleration for the tug is -490/3280 = -.149 m/s2

How do I calculate the time when given the initial speed, the distance between, and the acceleration of two objects?

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# Help with Newton's Third Law

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