Answer :
a) S(displacement)=ut+1/2at^2 a=f/m
thus s=1/2(13.3/25.1)(3.6)^2 ut dissapear because u=0
s=3.43m
b) the inertia has increased because the mass increases:
m(kart+child)=(245.98+27.4)/9.8
m=27.896
s=ut+1/2at^2
s=1/2(13.3/27.899)(3.6)
s=3.09m
thus s=1/2(13.3/25.1)(3.6)^2 ut dissapear because u=0
s=3.43m
b) the inertia has increased because the mass increases:
m(kart+child)=(245.98+27.4)/9.8
m=27.896
s=ut+1/2at^2
s=1/2(13.3/27.899)(3.6)
s=3.09m