Question

a rock is thrown straight up into the air. at the highest point of the rocks path, the magnitude of the net force acting on the rock is (1) less than the magnitude of the rocks weight, but greater than zero (2) greater than the magnitude of the rocks weight the same as the magnitude of the rocks ight 11. the diag shows a compressed spring between two at rest on a horizontal, frictionless surface. ass of 2 kilograms and cart b has a mass of string holds the carts together. the string is cut and the carts move apart. compared to the magnitude of the force the spring exerts on cart a, the magnitude of the force the spring exerts on cart b is (1) the same (3) twice as great half as great (4) four times as great

Explanation:

Step1: Analyze the force exerted by the spring

According to Newton's third law of motion, when the spring exerts a force on cart A, cart A exerts an equal and opposite force on the spring. Similarly, when the spring exerts a force on cart B, cart B exerts an equal and opposite force on the spring. The force that the spring exerts on cart A and the force that the spring exerts on cart B are action - reaction pairs with the forces from the carts on the spring. Since the spring is the same system interacting with both carts, the magnitude of the force the spring exerts on cart A is the same as the magnitude of the force the spring exerts on cart B.

Answer:

(1) the same