Two kinematics problems need checking and help

[sens]

Homework Statement

The Attempt at a Solution

The above is my attempt to solve question a), is this right approach? Now all i need to do is solve for theta? Or am i completely off track?

Also, i have no idea how to approach question b). some insight would be helpful... Thanks!

 

[TSny]

Yes, you have the correct approach. Yes, now solve for θ.

Solving (a) will help you see how to answer (b).

 

[sens]

thanks, i figured both of them out :)

 

[The Buttered Cat]

Looks like you're on the right track. Google trigonometric identities to figure out how to solve the quadratic. You'll get two angles as a solution.