How long will it take for the parcels to hit the ground after launch? (The neighbors are particular, your answer needs to be rounded to the hundredths
place and include the standard abbreviation of the units. Put a space between
the number and the units.)

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 790 n/m. it is initially at rest on an inclined plane that is at an angle of 28 degrees with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is k = 0.14. in the initial position, where the spring is compressed by a distance of a = 0.18 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

The plum pudding model of the atom state that ?

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.