A car crashes at 18 m/s and comes to rest in 1 second. The driver, whose mass is 60 kg, is protected by wearing a seat belt and the airbag inflating. The driver comes to rest in 2 seconds. What is the force of the driver? Please help! If you can, I might give to whoever has the best answer :)

Amixture of slurry and mud is to be pumped through a horizontal pipe of diameter 500 mm. the fluid behaves as a bingham plastic with a yield stress of 30 pa and viscosity 0.04 pa.s. describe the effects of the shear stress through a transverse section of the pipe by plotting the variation in shear stress and velocity profile: (i) just before the slurry starts to move (ii) as the slurry flows when the pressure gradient is double that in part (i)