+0

Collisions in 1 dimension

+1
161
2
+844

My working out is abit long so please bare with me as i have tried this multiple times and still failed:

i was told to always find the momentum and coefficient of restitution for these questions then do simultaneous equations

momentum: $$mua+mub = mva + mvb$$

$$-2(0.3) + 3(0.2) = (0.3)va + (0.2)va$$

$$0.3va + 0.2vb = 0.5$$

coefficient of restitution:

$$0.8=\frac{vb-va}{3-2}$$

$$-va + vb = 0.8$$

simultaneous:

0.5vb = 0.74

vb = 1.48 va = 0.68

However the markscheme says my answer should be VA=-0.6 VB=3.4

Mar 25, 2019

#1
+844
+1

NVM i used 2 for ub in my e equation instead of -2 in all 4 of my attempts..

Mar 25, 2019
#2
+105448
+2

It happens

Melody  Mar 25, 2019