Ff = friction force
15 - Ff = m a = 4 * 2 = 8
so Ff = 15 - 8 = 7 Newtons friction
then no acceleration so a = 0
so
F = Ff = 7 N
a 4.0kg block of wood is pulled along a horizontal ground from rest and a force of 15N is required to produce acceleration of 2.0metres per second squared . what should the magnitude of the force be in order to pull the block of wood at constant speed of 5.0m/s on the same horizontal ground
A. 5N B. 7N C. 8N D. 10N
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