E-Mail : support@onlinemathsguru.com
A rock is dropped into a pond, creating a circular ripple. The radius of the ripple increases steadily at 6 cm/s. A toy boat is floating on the pond, 2.00 m east and 1.00 m north of the spot where the rock is dropped. How long does the ripple take to reach the boat?
Solution
Calculate the distance d from the spot to the boat, and divide it by the speed v of the advancing ripple. Work with meters or cm, but not both at the same time. v = 6 cm/s = 0.06 m/s d = √[(2.00)2 + (1.00)2] m = ? m With v in m/s and d in meters, t = d/v = ? seconds Plug in the numbers and finish from here.