Two balls have masses 66 kg and 31 kg. The 66 kg ball has an initial velocity of 24 m/s (to the right) along a line joining the two balls and the 31 kg ball is at rest. The 31 kg ball has in initial velocity of 16 m/s. The two balls make a head-on elastic collision with each other. What is the final velocity of the 66 kg ball? Answer in units of m/s.

b. What is the final velocity of the 31 kg ball? Answer in units of m/s

like poles repel so keep pushing north to north and repels funny to see this

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it