A ball starting from rest accelerated uniformly at 5.0 m/s as it rolls 40 meters down an incline. How much time is required for the ball to roll the 40 meters?

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Answer 1 · 2015-11-19T23:16:17

#4"s"#

Firstly we can get the final velocity of the ball using:

#v^2=u^2+2as#

I will assume #a=5"m/s"^2#

#:.v^2=0+2xx5xx40=400#

#:.v=sqrt(400)=20"m/s"#

Now we can get the time using:

#v=u+at#

#:.20=0+5xxt#

#t=20/5=4"s"#