Question

a test car of mass 1250 kg is traveling at a speed of 72 kmph, when it is suddenly braked by locking the wheels. the average vehicle comes to a stop in a distance of 50 m. skid resisting force is.

Answer 1

72km/h=20m/s
acceleration=-vo^2/2*d
acceleration=-20^2/100
acceleration=-4m/s^2

F=m*a
F=1250*-4
F=-5000 N