A cart has a load of 100 kg sand at start and it is pulled by a steady resultant force of 100N starting from rest. A hole in the cart causes steady leakage of 1kg/s. Find velocity v of the cart after 50s of motion. What I know about this is that, we have to use calculus. dF =(dM /dT) *(dV/dT) dM/dT, since the mass varies with time and dV /dT that us the acceleration. I tried my best. Now someone correct my logic if wrong and tell me the concept to do this. Thanks in advance. I've posted this question like 3-4 times and someone deleted it for random reasons.