## Question:

The jet plane has a mass M and a horizontal velocity ${ v }_{ 0 }$ when t = 0. If both engines provide a horizontal thrust which varies as shown in the graph, determine the plane’s velocity at time ${ t }_{ 1 }$  . Neglect air resistance and the loss of fuel during the motion. Units Used:Mg = ${ 10 }^{ 3 }$ kg , kN = ${ 10 }^{ 3 }$ N Given: M = 250 Mg , ${ v }_{ 0 }$ = 100 m/s , ${ t }_{ 1 }$ = 15 s , a = 200 kN , b = ${ 2 kN/s }^{ 2 }$