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9 https://session.masteringphysics.com/myct/itemView?assignmentProblemiD-60994163 Elements of Physics - Herat (Spring 2016) Ch.4-HWR1Problem 4.18 Helo Close 1 of 4 1 next Problem 4.18 Part A A man pulling an emply wagon causes it to accelerate at 1.4 m/s What will the acceleration be if he pulls with the same force when the wagon contains a child whose mass is three times that of the wagon? Express your answer using two significant figures. m/s? Submit My Answers Give Up Incorrect; Try Again;attempts remaining correct; Try Again Kattempts remaining ! Continue

Explanation / Answer

Suppose mass of wagon is m .

using newton's 2nd law,

Fnet = ma

F = 1.4m    => 1.4 = F/m

now force is same but mass is changed.

new mass = mass of child + mass of wagon = 3m + m = 4m

F = 4m a'

F / 4m = a'

a ' = 1.4 / 4   = 0.35 m/s^2 ............Ans

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