# Physics

1. The mass of Kerry and the sledge together is 40 kg.
Sam pushes with a force of 50 N for 4 s.
a. What is the value of the quantity: (force x time) during which the force acts? 50 x 4 = 200
b. So what is the increased momentum of Kerry and the sledge?
c. What speed does Sam get the sledge up to after 4 s?

1. a=F/m = 50/40 =1.25 m/s²
Δ v=a •Δ t =2•4 = 8 m/s
Δp= m •Δ v= 40•8 = km•m/s

posted by Elena

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