If a force of 10 N stretches a spring 0.5 m, what is the spring constant?

A10.0 kg cart and a 15kg cart are locked together with a compressed spring between them. they are then released so that the spring pushes the two carts apart. the 10.0 kg cart is moving at 4.5 m/s afterward. how fast is the 15kg cart moving? 3.0 m/s 2.0 m/s 4.5 m/s 5.0 m/s

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

Explain vector addition, triangle method and parallelogram method