A skier finishes her run and begins coasting to a stop. Assume that she has a velocity of 25 m/s northwards when she starts coasting.

A skier finishes her run and begins coasting to a stop. Assume that she has a velocity of 25 m/s northwards when she starts coasting. If she travels 100m before coming to a complete stop, how long does it take her to stop and what is her (assumed to be constant) acceleration?