Sam, whose mass is 70 kg , takes off across level snow on his jet-powered skis.
ID: 1534944 • Letter: S
Question
Sam, whose mass is 70 kg , takes off across level snow on his jet-powered skis. The skis have a thrust of 210 N and a coefficient of kinetic friction on snow of 0.1. Unfortunately, the skis run out of fuel after only 10 s . (Part A) What is Sam's top speed? Express your answer to two significant figures and include the appropriate units. v = SubmitMy AnswersGive Up (Part B) How far has Sam traveled when he finally coasts to a stop? Express your answer to two significant figures and include the appropriate units. s =
Explanation / Answer
Net force on sam
Fnet = 210 - (0.1x70x9.8) = 141.4 N
Fnet = ma
a = 2.02 m/s^2
a)
Top speed
V =a xt
V = 2.02x10
V = 20.2 m/sec
b)
initial distance
S1 = 0.5xa x 10x10
S1 = 101 m
distance of retardation
S2 = V^2/2x0.1x9.8
S2 = 208.18 m
so total distance
S = S1+S2 = 309.183 m
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