Answer:
1714N
Explanation:
The change in momentum of an object is the product of mass and the change in velocity
The magnitude of the netforce can be calculated using 12kg/7.0ms
But we can convert 7ms to "s" = 7× 10^-3s
F= Force = 12/7×10^-3= 1714N
Hence, the magnitude of the net force on the punching bag is 1714N