A 20-Kg Block Is Attached to One End of a Spring

question 88

Multiple Choice

A 2.0-kg block is attached to one end of a spring with a spring constant of 100 N/m and a 4.0-kg block is attached to the other end.The blocks are placed on a horizontal frictionless surface and set into motion.At one instant the 2.0-kg block is observed to be traveling to the right with a speed of 0.50 m/s and the 4.0-kg block is observed to be traveling to the left with a speed of 0.30 m/s.Since the only forces on the blocks are the force of gravity, the normal force of the surface, and the force of the spring, we conclude that:

• A)the spring is compressed at the time of the observation
• B)the spring is not compressed at the time of observation
• C)the motion was started with the masses at rest
• D)the motion was started with at least one of masses moving
• E)the motion was started by compressing the spring

---

Definitions:

WACC

Weighted Average Cost of Capital is an evaluation method for determining the cost of a company's capital, with each source of capital weighted based on its relative proportion.

Present Value

Present value is the current worth of a future sum of money or stream of cash flows, given a specified rate of return.

Regular IRR

The Internal Rate of Return (IRR) is a financial metric used to estimate the profitability of potential investments.

WACC

The Weighted Average Cost of Capital represents the average cost of a company's financing (debt and equity), where each form of capital is weighted according to its proportion in the overall financing mix.