A student wants to know if the weight of a cart affects its speed at the bottom of a ramp. He changes the weight of the carts by adding different numbers of balls, and he keeps the height of the ramp the

A student wants to know if the weight of a cart affects its speed at the bottom of a ramp. He changes the weight of the carts by adding different numbers of balls, and he keeps the height of the ramp the same.

What is his independent (test) variable?

The shape of the carts.

The angle of the ramp.

The weight of the carts.

The height of the ramps.

A student wants to know if the weight of a cart affects its speed at the bottom of-example-1

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