Physics worksheet focusing on Newton's Second Law, featuring problems on calculating net force, mass, acceleration, and time for various scenarios.

Worksheet titled "Newton's 2nd Law" with four physics problems related to force, mass, and acceleration, including calculations for a water skier, an object, a cart, and a box, with a watermark "WORKSHEETZONE" across the image.

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- 1. The net force is calculated using Newton's Second Law, F = m * a. For the water skier, F = 79 kg * 1.4 m/s² = 110.6 N.
- 2. Rearranging Newton's Second Law to solve for mass gives m = F / a. For the object, m = 32 N / 0.88 m/s² ≈ 36.36 kg.
- 3a. Using F = m * a, the acceleration is a = F / m. For the cart, a = 15 N / 2.1 kg ≈ 7.14 m/s².
- 3b. Using the kinematic equation d = (1/2) * a * t² (since it starts from rest), we solve for time: t = √(2d / a). For the cart, t = √(2 * 2.8 m / 7.14 m/s²) ≈ √(0.784) ≈ 0.885 s.
- 4. First, find the mass of the box using its weight: W = m * g, so m = W / g = 666 N / 9.8 m/s² ≈ 67.96 kg. Then, use F = m * a to find acceleration: a = F / m = 777 N / 67.96 kg ≈ 11.43 m/s².

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