1. The problem statement, all variables and given/known data The acceleration of a particle is defined by the relation a=0.4(1-kV), where k is a constant. Knowing t=0 the particle starts from rest at x=4m and that when t=15s, V=4 m/s, determine.... a)the constant k b)the postion when V=6m/s c) the maximum velocity of the particle 2. Relevant equations 3. The attempt at a solution a=0.4(1-kV) 0.4(1-kV)=dV/dt.........im lost after this, can someone just simply point me in the right direction.