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# forces question watch

1. this is part of a question from a past paper and i realy dont see where ive gone wrong

a cyclist pedalling along a road reaches a steady speed of 5m/s the total mass of cyclist and bike is 120kg
the total resistive forces are 40N

find the total distance travelled before coming to a halt assuming resistive force is constant

i tried calculating the decelleration but got the wrong answer could someone else try

thanks alot
2. (Original post by sarah12345)
this is part of a question from a past paper and i realy dont see where ive gone wrong

a cyclist pedalling along a road reaches a steady speed of 5m/s the total mass of cyclist and bike is 120kg
the total resistive forces are 40N

find the total distance travelled before coming to a halt assuming resistive force is constant

i tried calculating the decelleration but got the wrong answer could someone else try

thanks alot
f=ma so a = f/m
a= -40N/120kg = -1/3 m/s²

v=u+at
t=(v-u) /a
t= -5 / -0.33..
t=15secs

so x=ut + ½at²
x=5*15 - 37.5
x=37.5m

or u can use v²=u² +2ax
0=5² + 2 * 1/3 * x
x = 75/2
= 37.5m

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