Water skier is towed by a motorboat at a constant velocity of magnitude 15km/h. The boat speeds up, and after a short interval the skier is towed at a new constant velocity of magnitude 20km/h. What is the net force on the skier when she is moving at 15km/h and at 20km/h ?
A boat starts moving with a velocity 3i +4j m/s with respect to the ground . The water in the river is moving with velocity 8i + 4j m/s with respect to the ground. What is the resultant velocity of boat ? is the river and the boat moving in the same direction ?