Aboat's motor pushes with 25 n of force and viscous
friction resists with 5 n. if the boat is 100 kg, find its
acceleration.

0.2m/s^2

Explanation: newton's first law of motion: F=ma. Fnet=applied force-frictional force. Therefore, Fnet=ma. Make "a" the subject of the formula which will result a=(Fappl-Frict)m.

Therefore a=(25-5)N/100kg

a= 20/100

a= 0.2m/s^2

potential energy is directly proportional to height.

more height = more potential energy.

greatest increase in height = greatest increase in potential energy

where are the points with the greatest increase in height ?

has to be c-e or d-e .

f=ma a/f/m a= 480/60 a = 8m/s/s that is quick wow