brainliest for the first to answer
janet’s science teacher assigns janet and her classmates the task of conducting an investigation that shows how the mass of an object affects its speed. they are provided with a small cart and objects with different masses that they can put inside the cart.

which investigation design would be the best choice for the assignment?

a.

use the same amount of mass in the cart for five different trials, roll the cart down a ramp with a different slope for each trial, and measure the distance the cart travels before it stops each time.

b.

use a different amount of mass in the cart for five different trials, and measure the force needed to start the cart rolling each time.

c.

use a different amount of mass in the cart for five different trials, roll the cart down a ramp with the same slope for each trial, and measure how long it takes the cart to roll one meter each time.

d.

use the same amount of mass in the cart for five different trials, push the cart along the floor with a different force for each trial, and measure how long it takes the cart to stop each time.