A 60kg person is holding two 10kg blocks and she throws them one at a time at 5m/s.
What is her final speed?
What I get is,
after she throws the first rock 0=70v-50 so her speed is 5/7 m/s,
and after she throws the second 5/7 *70=60v-50 so her final speed is 5/3 m/s (1.67 m/s)
But the...