A speed boat covers 2.00 km in 60.0 s while smoothly slowing down to a final spe

Question

A speed boat covers 2.00 km in 60.0 s while smoothly slowing down to a final speed of 4.50 m/s. a) find the original speed of the speed boat. B) Find the acceleration of the speedboat. C) Find the acceleration of the speedboat as it remains at a constant 4.50 m/s after 60.0 s. A speed boat covers 2.00 km in 60.0 s while smoothly slowing down to a final speed of 4.50 m/s. a) find the original speed of the speed boat. B) Find the acceleration of the speedboat. C) Find the acceleration of the speedboat as it remains at a constant 4.50 m/s after 60.0 s. A speed boat covers 2.00 km in 60.0 s while smoothly slowing down to a final speed of 4.50 m/s. a) find the original speed of the speed boat. B) Find the acceleration of the speedboat. C) Find the acceleration of the speedboat as it remains at a constant 4.50 m/s after 60.0 s.

Explanation / Answer

Final Velovity ,v = 4.5 m/s

Distance travel in 60 seconds , d = 2000 m

Time taken by car ,t = 60 s

average velocity = d/t = (v+u)/2

2000/60 = (4.5+u)/2

u = 200/3 - 4.5 = 62.167 m/s(Answer a)

v^2 - u^2 = 2ad

(4.5)^2 - (62.167)^2 = 4000a

4000a = 20.25 - 3864.74

a = - 0.96 m/s^2 (Answer b)

and after 60 seconds when the speed will be constant then acceleration will be zero (Answer c)

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