Question

A boat travels straight across a river with a net force of 150 N. If the boat is aimed 22° upstream, what is the magnitude of the force of the current?

Answer 1

Let the force of the current be $\mathbf{F}_c$. Then from the right triangle above, obtain:

$$F_c = 150N\cdot \sin 22\degree \approx 56.2N$$

Answer. 56.2 N.