You attach a cart with a mass of 2.6 kg to a spring and compress the cart-spring system so that the cart is located 40 cm behind the springs equilibrium point. If the cart is released and has a velocity of 2.0 m/s when it reaches the equilibrium position, what is the spring constant k?

Aman pushes on a trunk with a force of 250 newtons. the trunk does not move. how much positive work is done on the trunk? 0.0 j -250 j 250 j 125 j

The sun generates both mechanical and electromagnetic waves. which statement about those wave is true?

The first-order reaction a→2b+c has rate constant 0.538 s−1. if the initial concentration of a is 0.867 mol l−1, what is the half-life of the reaction in seconds? remember to use correct significant figures in your answer (round your answer to the nearest hundredth). do not include units in your response.