Question

) A speedboat has a mass of 500kg. It starts from rest and travels 200m in 12seconds. The boat undergoes constant acceleration during 12seconds. Find the magnitude of unbalanced force acting on the boat?

Answer 1

Initial velocity (u) = 0m/s

Distance travelled (s) = 200m

Time taken(t) = 12s

By second equation of motion,

s=ut+1/2at^2

200= 0(12) + 1/2(a)(12)^2

200= 72a

a= 200/72m/s^2

F= m×a

F = 500×200/72 = 1388.88 N(approx.)