Question

A wide river flows from North to South at a steady rate of 2 m/s. The motor boat has been tested on a calm pond and it was found that it goes through the water at 5 m/s. Make the downstream direction positive. www During a 5 second period how much distance does the boat move over the water as seen by the person in the inner tube.

Answer 1

35 meters

Step-by-step explanation:

The river flows at 2 m/s from North to South and motor can propel the boat at 5m/s. As the downstream direction is positive, we are considering the river flow also propels the boat adding its speed to the boat. It means the boat and the person in the inner tube are in fact moving at 7 m/s. Distance can be calculated as follows:

`v = d/t` ⇒
`d = vt` ⇒
`d = 7(m)/(s)x5s`

`d = 35m`