A woman is pushing a 38.7kg lawnmower initially at rest with a 68.7N forward force against friction. The lawnmower speeds up to 1.44m/s in 3.81s. How much force does friction evert on the mower

expected acceleration= 68.7/38.7=1.77 m/s^2

witnessed acceleration = 1.44/3.81 = 0.37 m/s^2

difference = 1.4m/s^2

so friction = 38.7× 1.4= 54.18 N

speed

ratio of distance traveled to time interval

net force

vector sum of forces on object

object

source of diverging light rays either luminous or illuminated

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explanation: