8. For each statement, write true or false. A)only the net force acting on an object can do work. i think its TRUE. B)no work is done on a particle that remains at rest. i think its TRUE. C)a force that is always perpendicular to the velocity of a particle never does work on the particle. i think its TRUE. ^ please correct me if im wrong.. ^ thx. 6. A particle of mass m moves along the x axis. Its position varies with time according to x=2t^3 + 4t^2 where x is in meters and t is in seconds. B)find the power delivered to the particle at any time t. ???? C)the work done by the force from t=0 to t=11 im guessing i have to integrate the equation 2t^3 + 4t^2 with 11 on top right of the integration sign and 0 on the bottom of the integration sign. any comment will be hhelpful. thx in advance! 10. If a ski lift raises 100 passengers averaging 660N in weight to a height of 150m in 60s, at constant speed, what average power is required of the force making the lift? I got P = W/t = mgh/t = 660N*150m/60s = 1650W = 1.6kW did i do this right?