Working out the resultant force
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Working out the resultant force

[From: ] [author: ] [Date: 11-05-07] [Hit: ]
that would be great:) Thank you!-F = m*a = 80 kg*1.The time would be required to find the speed or distance covered,calculation of F= 80 x 1.unit mark (N , newtons ) - 1 mark-80 x 1.......
I'm stuck on a science question from a past paper

A cyclist travelling along a straight level road accelerates at 1.2m/s^2 for 5 seconds. The mass of the cyclist and the bicycle is 80kg.
Calculate the resultant force needed to produce this accelerate.

I know resultant force = mass x acceleration, but this question is worth 3 marks, so I didn't think my answer was worth 3 marks.

I don't want the answer, but if you could please explain to my how to do this, that would be great:) Thank you!

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F = m*a = 80 kg*1.2 m/s² = 96 N

The time would be required to find the speed or distance covered, which is not a part of this problem:

V = a*t m/s
D = ½a*t² m

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use of F = m x a - 1 mark

calculation of F = 80 x 1.2 - 1 mark

resultant force acts horizontally along the straight level road - 1 mark

unit mark (N , newtons ) - 1 mark

-
80 x 1.2 =96 2 marks

all you need is to add the units for the extra
which im unsure on
1
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