Please help me with these problemsSolution1 Assuming that th

Please help me with these problems

1. Assuming that the bullets stop after hitting the object:

F=d(mv)/dt= mRv

2. Assuming that the blown air stops after hitting the ground:

F=Mg=d(mv)/dt=Av

=> v=Mg/A

3. Ft=p

weighing scale reading(at time t) results from two contributions:

1)weight of the part of the chain that lie on the machine=(M/L)(gt²/2)g=Mg²t²/2L

2) the force F that acts on the falling chain to stop it.

v(t)=gt

F= (M/L)v²=Mg²t²/L

Hence total reading= 3Mg²t²/2L

4. Assuming that initially there is no dirt on the belt and wt of conveyer belt is negligible, and that its length is infinite:

P=Mv=Rtv