How does gravity affect projectile motion?

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.