## Question:

The slider block of mass M is moving to the right with speed v when it is acted upon by the forces ${ F }_{ 1 }$ and ${ F }_{ 2 }$. If these loadings vary in the manner shown on the graph, determine the speed of the block at t = ${ t }_{ 3 }$. Neglect friction and the mass of the pulleys and cords. Given: M = 40 kg , v = 1.5 m/s , ${ t }_{ 3 }$ = 6 s , ${ t }_{ 2 }$ = 4 s , ${ t }_{ 1 }$ = 2 s , ${ P }_{ 1 }$ = 10 N , ${ P }_{ 2 }$= 20 N , ${ P }_{ 3 }$ = 30 N , ${ P }_{ 4 }$ = 40 N