A shopping cart that is full of groceries (30kg) is traveling to the right at 40m/s. It collides head on with a stationary, empty cart (10kg). The empty cart is set in motion by the impact. If the empty cart moves with a velocity of 10m/s at what velocity does the full cart move after the collision?

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.