# Zak moves a 46.3kg sofa 7.5 m with a constant force of 21N.What is the average acceleration of the sofa? Answer in units of m/s 2 .?

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- JimLv 72 months ago
F = ma

then a= F/m = 21/46.3 = 0.4535637149 m/s²

Now round to 2 sigfigs since 21N only has 2 digits: 0.45 m/s²

assumes frictionless floor!

The 7.5m is unnecessary extra info as would be the temperature in the room!

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- oubaasLv 72 months ago
aver. a = F/m = 21/46.3 = 0.454 m/sec^2 (displacement is useless)

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- 2 months ago
acceleration is f/m so divide 21 by 46.3 and you get N/kg units which is the same as m/s^2

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- Anonymous2 months ago
Is this all the information you are given and not just one of several questions? I don't see how you can answer it with just this information.

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