Question on: JAMB Physics - 2024

Here's how to solve the problem:

1. Understand the concepts:

• Velocity Ratio (VR): The ratio of the distance moved by the effort to the distance moved by the load. In this case, VR = 2.
• Mechanical Advantage (MA): The ratio of the load to the effort (MA = Load/Effort).
• Efficiency (η): The ratio of the useful work output to the work input. Efficiency = (MA/VR) * 100%

2. Use the efficiency formula:

• 60% = (MA / 2) * 100%
• 0.6 = MA / 2
• MA = 0.6 * 2 = 1.2

3. Use the Mechanical Advantage formula to find the Effort:

• MA = Load / Effort
• 1.2 = 300N / Effort
• Effort = 300N / 1.2 = 250N