Aman walks foward on a bus. to a stationary obserrver, the bus moves east at a speed of 18 m/s if the man moves 1.5 m/s wast relative to the bus. what is his velocity in the frame of reference of a stationary observer?

The material that keeps its new shape after it is stretched is called?

What is the role of lenses in microscopy?

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.