A car moving at 60 km/h skids 13 m with locked brakes. How far will the car skid with locked brakes at 180 km/h?

Answer 1

Convert initial velocities to m/s
60 km/h=60*1000/3600 m/s=16.67 m/s
180 km/h = 50 m/s

Use kinematic equation:
v^2-u^2=2aS
where
u=initial velocity
v=final velocity
a=acceleration (deceleration is negative)
S=distance travelled before stopping