physics help

Question

 A car has an initial velocity of +30.0 m/s and undergoes an acceleration of -5.00 m/s squared for 5.00 seconds. What is the displacement after the acceleration? And what is the velocity after the acceleration 

Answer 1

Displacement = Initial velocity x time  +1/2 x accel x (time )²

                     = 30x5 -1/2x(5x 25)

                     =( 150  -125/2) m

 

V( final ) = Initial vel + accelxtime 

          =30 - 5x5

          = 5m/s