Posted by **Lesley** on Sunday, February 27, 2011 at 6:20pm.

How much work is done in accelerating a 2000 kg car from rest to a speed of 30 m/s?

- Physics -
**bobpursley**, Sunday, February 27, 2011 at 6:43pm
what is the final KE? Work must be equal to that.

- Physics -
**drwls**, Sunday, February 27, 2011 at 6:44pm
The work done equals the increase in kinetic energy, if there is no friction.

They should have told you to assume that.

In the real world, there will be some friction.

I assume you know how to calculate the kinetic energy. When at rest, the kinetic energy is zero.

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