An object of the same mass has three different weights at different times. Which statement is possible?
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The object gains matter and then loses it.
The object started on Earth, was transported to space, and was deposited on the moon
The object started at the bottom of a hill, then moved to the top of the hill, and then moved back down to the bottom of the
hill
The object changes shape, which changes its weight.

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.