Question

plz tell this numerical step by step please i will mark as bra nlist ​

Answer 1

Answer:

which sum say that or fully

Answer 2

Answer:

8. a) F=dp/dt  

         =m(v-u)/dt   (∵dp=change in momentum=mv-mu)

         =10(23-15)/4

         =80/4=20 N

   b) 20=10(v-15)/10

       20=v-15

     ∴v=35 m/s