Find the polar angle (in radians with respect to +x-axis) of −3i + j.

Explanation:

Let be the polar angle of −3i + j. We can find it using the formula as follows :

So, the required polar angle is .

we're given that v₀ = 0 and a = 5.4 m/s². therefore, since v = at + v₀ for constant acceleration the equation for velocity is

after 28s,

m/s

which i would round to 150 m/s as my final answer