Question 881782
This is a physics problem and not an algebra problem.
Assume that there is conservation of momentum.
{{{p[i]=1500(25)+1000(15)}}}
{{{p[f]=1500(20)+1000(V)}}}
By conservation of momentum,
{{{p[i]=p[f]}}}
{{{52500=30000+1000V}}}
{{{1000V=22500}}}
{{{V=22.5}}}{{{m/s}}}