29. Sea waves move towards a beach at a constant speed of 2.0 ms". They arrive at the beach with a frequency of0.10Hz. A girl on a surfboard is moving in the sea at right angles to the wave fronts. She observes that the surfboard crosses the wave fronts with a frequency of 0.40 Hz. beach wave direction girl on surfboard What is the speed of the surfboard and what is the direction of motion of the surfboard relative to the beach? Speed of surfboard Direction of motion of relative to the beach I ms'1 surfboard relative to the beach A. 6.0 towards beach B. 6.0 away from beach C. 1.5 towards beach D. 1.5 away from beach