Ninja usually weighs 80 kg. He ate 5 kg of cookies over the Holiday Break: a. What is his weight? and B. How can ninja use physics to lose weight?

Ridiculous question. Over two weeks, someone had to have addition fluids, food, and eliminated wastes.

the total kg would be 85 kg. then multiply by 9.8 to find fg. to lose weight he has to have a downward acceleration ( push downwards on a countertop while standing on the scale).

Lets say that ninja gained those 5kg's of weight over the break. Then he would now weigh 85kg.

Weight is Mass multiplied by gravity.
W=Mg
85 is your mass and 9.8 is gravity on Earth.
85*9.8=833
That is the answer to A. c:

Ninja can loose weight by, as Ali said, pushing downwards on a countertop. He can gain weight by standing on one foot.

Why does a person sitting in one train think that the other train is at rest, when both the trains are moving on a parallel tracks with the same speed and in the same direction?

To find out Ninja's weight after eating 5 kg of cookies, we need to add the weight of the cookies to his original weight.

a. Ninja's weight after eating 5 kg of cookies:
Weight after eating cookies = Original weight + Weight of cookies
Weight after eating cookies = 80 kg + 5 kg
= 85 kg

Therefore, Ninja's weight after eating 5 kg of cookies is 85 kg.

b. Physics can play a role in helping Ninja lose weight. By understanding and applying principles of physics, Ninja can effectively manage his weight. Here are a few examples:

1. Caloric Deficit: Weight loss can be achieved by creating a caloric deficit, which is the difference between calories consumed and calories burned. The basic principle is that Ninja needs to burn more calories than he consumes. Physics can help by understanding the energy balance equation, knowing the energy content of food, and estimating the energy expenditure during physical activities.

2. Exercise: Physical activities, such as sports or workouts, involve various principles of physics. Movements, force, resistance, and energy transfer are all governed by the laws of physics. By engaging in regular exercise, Ninja can burn more calories, increase metabolism, and improve overall fitness.

3. Metabolism: The study of thermodynamics, a branch of physics, can help Ninja understand how his body converts food into energy and how different food choices can impact his metabolism. By making informed choices about his diet based on the laws of thermodynamics, Ninja can optimize his metabolism for weight loss.

4. Body Mechanics: Understanding the physics of body mechanics can help Ninja exercise more efficiently and reduce the risk of injury. Proper form, balance, and understanding the forces involved in physical movements can lead to better training and weight loss outcomes.

Remember, weight loss is a complex process influenced by various factors, including genetics, dietary choices, and physical activity. While physics provides a foundation for understanding the science behind weight loss, it's important for Ninja to consult with a healthcare professional or a certified nutritionist for personalized advice and guidance.