Determine the displacement of a plane that is uniformly accelerated from 66 m/s to 88 m/s in 12 sec

An ideal spring has a spring constant (force constant) of 2500 n/m, is stretched 4.0 cm, how much elastic potential energy does it possess? (a) 3j (b) 0.00j (c) 1j (d) 2j (e) 4j

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

What’s #16 asking me and how do i solve it?