##### A boat moves through the water with two forces acting on it.

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One force is a 2100N forward push by the motor and the other is an 1800N resistive force due to the water.

a. What is the acceleration of the 1200kg boat?

b. If it starts from rest, how far will it move in 10 seconds?

Oct 12th, 2015

net force = 2100N-1800N=300N

a. acceleration = F/m = 300N/1200kg = 0.25 m/s^2

b. speed = a*t=0.25m/s^2 * 10s = 2.5 m/s

Oct 12th, 2015

Are you willing to answer a few more questions? If not then that's fine.

Oct 12th, 2015

sure

Oct 12th, 2015

I'm kinda confused with this question, and I don't know where to start.

A car is traveling at 20m/s on a flat highway. If the coefficient of friction on a rainy day is 0.1, what is the minimum distance needed for the car to stop?

Oct 12th, 2015

vf=0

F=ma and F=coefficient of friction*mg, so a=coefficient of friction*g = 0.1*9.8=-0.98m/s^2

d= v0^2/(-2a)=20^2/(1.96)=204.1 m

Oct 12th, 2015

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Oct 12th, 2015
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Oct 12th, 2015
Oct 20th, 2017
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