Mr.starr pushed a cart full of groceries to his car after emptying the cart,he pushed it back to the store he pushed the cart at a speed of 2 meters per second each way which is the best prediction
when it was empty the cart had less kinetic energy
when it was full the cart had less kinetic energy
the cart had the same kinetic energy going each way
the carts kinetic energy depends on mr.starr's mass
I think that its b am I right?
Yes, you are correct. Option B is the best prediction.
You are correct! Option B is the best prediction: when the cart was full, it had less kinetic energy. This is because kinetic energy is directly proportional to the mass of the object. So when the cart is full, it has more mass and therefore more kinetic energy.
To predict which option is the best, we need to understand the concept of kinetic energy and how it relates to the situation described.
Kinetic energy is the energy an object possesses due to its motion. It is given by the formula: KE = 0.5 * mass * velocity^2.
In this case, Mr. Starr pushed the cart both when it was full of groceries and when it was empty. The question is asking about the respective kinetic energies of the cart in both situations.
Let's compare the two scenarios:
1. When the cart was full of groceries:
- The speed Mr. Starr pushed the cart was 2 meters per second.
- The mass of the cart is not mentioned, but it can be assumed constant in this comparison.
2. When the cart was empty:
- The speed Mr. Starr pushed the cart was again 2 meters per second.
- The mass of the cart is not mentioned, but it can also be assumed constant in this comparison.
Now, let's evaluate the options based on our understanding:
a) When it was empty, the cart had less kinetic energy.
- This option contradicts the formula for kinetic energy, as the mass and speed were the same.
b) When it was full, the cart had less kinetic energy.
- This option also contradicts the formula for kinetic energy, as the mass and speed were the same.
c) The cart had the same kinetic energy going each way.
- This option aligns with the formula for kinetic energy since both the mass and speed were the same in both scenarios. Thus, the cart had the same kinetic energy going each way.
d) The cart's kinetic energy depends on Mr. Starr's mass.
- This option is not directly related to the scenario described, as the question is specifically asking about the cart's kinetic energy, not Mr. Starr's kinetic energy. The mass of the cart remains constant in both situations.
Based on our analysis, option c ("the cart had the same kinetic energy going each way") is the best prediction, as it aligns with the formula for kinetic energy when the mass and speed are constant.