Question

1. A car speeds up from 15 m/s to 35 m/s in a time of 5.0 s. What is its acceleration?

2. A 20-kg crate slides along a rough horizontal floor. The coefficients of friction between the crate and the floor are μ_{s max} =0.5, and μ_k =0.25. How strong is the friction force that acts on the crate as it slides across the floor?

3. A man pushes a 100-kg couch across a carpeted floor. As he pushes, the couch moves at a constant speed of 3 m/s. What net force acts on the couch as the it continues to move in uniform motion?

4. In the lab, a 2.0 kg ball hangs at rest while supported by a string. Consider the tension force that is exerted by the string on the ball. What is the Newton’s 3^rd Law force pairto this force?

5. A ball is thrown with an initial speed of 5.0 m/s directed 28 degrees above the horizontal. What is the vertical component of the ball’s initial velocity?

Answer 1