Ahockey puck with a mass of 0.35 kg slides across the ice after a slap shot toward the goal. if the puck decelerates at 7.8 m/s/s, what is the coefficient of friction between the ice and the puck?

The sliding friction is the net force acting on puck in horizontal direction,
Therefore, from Newton's 2nd law of motion,
f = ma 
f = sliding frictional force = μmg 
μ =coefficient of sliding friction, m = mass of puck, a = deceleration = 7.8 m/s²
∴ μmg = ma
∴ μ = a/g = 7.8/9.8 = 0.795
Therefore, the coefficient of friction is 0.795

Jet streams are relatively narrow bands of strong wind in the upper levels of the atmosphere. the winds blow from west to east in jet streams but the flow often shifts to the north and south. jet streams follow the boundaries between hot and cold air. the earth's rotation is responsible for the jet stream as well.

This did i unseated, sorry