A1000 kg boat is traveling at 90 km/h when its engine is shut off. the magnitude of the frictional force f → k between boat and water is proportional to the speed v of the boat: fk = 70v, where v is in meters per second and fk is in newtons. find the time required for the boat to slow to 45 km/h.

9.9 s

Explanation:

mass (m) = 1000 kg

initial speed (u) = 90 km/h

final speed (v) = 45 km/h

relationship between the speed (v) of the boat and the frictional force (fk) ⇒ fk = 70v

       a =

        (a) = = =

        (a) = =

        t =            

i believe the answer would be:

d. violin, clarinet, french horn, and tuba

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