 #1
chwala
Gold Member
 2,201
 285
 Homework Statement:

Kindly see attached; interest only on parts;
a, c and d
 Relevant Equations:
 Kinematics equations
This is the question; I made some math error...then i just realised this is an easy problem...anyway, i know you guys may have an alternative approach to this; kindly share...
For part (a) i have;
##a=\dfrac{10}{t_1}## and ##2a=\dfrac{2010}{(t_1+t_2)t_1}##
##⇒\dfrac{10}{t_1}=\dfrac{10}{2t_2}##
##t_1=2t_2##
For part (c); i have
##A_{total}= A_1+A_2+A_3##
where
##A_1=\dfrac{1}{2} × t_1 × 10##
##A_2=\dfrac{1}{2} × t_2 × (20+10)##
##A_3= 24 × 20##
##555=10t_2+15t_2+480##
##75=25t_2##
##t_2=3## seconds
##t_{total}=6+3+24=33##seconds
For part (d),
##a=\dfrac{10}{3}=3\frac{1}{3} m/s^2##
Cheers! Bingo!
For part (a) i have;
##a=\dfrac{10}{t_1}## and ##2a=\dfrac{2010}{(t_1+t_2)t_1}##
##⇒\dfrac{10}{t_1}=\dfrac{10}{2t_2}##
##t_1=2t_2##
For part (c); i have
##A_{total}= A_1+A_2+A_3##
where
##A_1=\dfrac{1}{2} × t_1 × 10##
##A_2=\dfrac{1}{2} × t_2 × (20+10)##
##A_3= 24 × 20##
##555=10t_2+15t_2+480##
##75=25t_2##
##t_2=3## seconds
##t_{total}=6+3+24=33##seconds
For part (d),
##a=\dfrac{10}{3}=3\frac{1}{3} m/s^2##
Cheers! Bingo!