a 45kilo roller-blader accelerates from rest to 4.5ms-1 in 3.0seconds.
calculate the force requied by the roller-blader, if there are opposing friction forces of 40N acting? include a lbelled vector diagram in your answer.
The subject is physics, not your grade level.
We cannot provide figures with our answers.
The acceleration needed in this case is
a = (velocity increase)/(time)
= 4.5/3.0 = 1.5 m/s^2
Use Newton's second law,
F = m a,
to get the force required (in Newtons).