Posted by **Jessica** on Wednesday, February 1, 2012 at 1:19pm.

A bicycle and its rider together have a mass of 80 kg. If the bicycle's speed is 6m/s, how much force is needed to bring it to a stop in 4 seconds

- Physical Science -
**bobpursley**, Wednesday, February 1, 2012 at 1:21pm
a= F/masstotal

vf=Vi+at

0=6+F/80 * 4

solve for F.

- Physical Science -
**Lauren**, Thursday, January 16, 2014 at 4:43pm
a=change in vel./time

6m/s-0m/s divided by 4 sec.

acc. = 1.5 m/s^2

F=ma

F= (80 kg)(1.5m/s^2)

F=120N

Hope this helps! :D

- Physical Science -
**Anonymous**, Wednesday, February 17, 2016 at 10:35am
a force of 20n gives a brick an acceleration of 5m/s^2. what force would be needed to give the brick an acceleration of 1m/s^2

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