Hi guys. I'm new here. If i did any mistake please forgive me. First of all I have a simple problem need all of you to help me. Here is the problem The acceleration of a particle is defined by the relation a = -k√v, where k is constant. Knowing that x = 0 and v = 81 m/s at t = 0 and v = 36 m/s x = 18 m determine (a) the velocity of the particle when x = 24 m (b) the time required for the particle to come to rest.