Question: Problem 3. Recall from Section 5.2 that if two vectors u and u meet at an angle 0, then = || || cos(0). Draw

Problem 3. Recall from Section 5.2 that if two vectors u and u meet at an angle 0, then = || || cos(0). Draw a picture illustrating this formula in the xy-plane, i.e. when u and are two-dimensional vectors. Problem 4. A block sliding down a surface with a 45 slope can be stopped by precisely 18 kg of force. Ignoring friction, what is the weight of the block? Hint: represent the weight of the block (that is, the force on the block due to gravity) and the stopping force as vectors.
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