1 A sled of mass 5.4 kg is at rest on a rough surface. A string pulls with a tension of 43.4N at an angle of 31 degrees above the horizontal. What is the magnitude of the friction?

2 A sled of mass 5.3 kg is at rest on a rough surface. A string pulls with a tension of 44.9N at an angle of 57 degrees above the horizontal. What is the normal force?

3 A sled of mass 5.9 kg is at rest on a perfectly smooth surface. A string pulls with a tension of 47.3N at an angle of 48 degrees above the horizontal. How long will it take to reach a speed of 10.8 m/s?

4 A sled of mass 2.1 kg is on perfectly smooth surface. A string pulls with a tension of 17.5N. At what angle above the horizontal must the string pull in order to achieve an accelerations of 2.8 m/s^{2}?

1 A sled of mass 5.7 kg is at rest on a rough surface. A string pulls with a tension of 41.6N at an angle of 34 degress above the horizontal. What is the magnitude of the friction?

2 A sled of mass 5.4 kg is at rest on a rough surface. A string pulls with a tension of 40.4N at an angle of 39 degress above the horizontal. What is the normal force?

3 A sled of mass 5.7 kg is at rest on a perfectly smooth surface. A string pulls with a tension of 44.3N at an angle of 31 degress above the horizontal. How long will it take to reach a speed of 9.2 m/s?

4 A sled of mass 2.3 kg is on perfectly smooth surface. A string pulls with a tension of 18.3N. At what angle above the horizontal must the string pull in order to achieve an accelerations of 2.8 m/s^{2}?