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https://session.masteringphysics.com/myct/itemView?assignmentProblemID General Physics I (Phys 2110) Chapter 6 HW When Push Comes to Shove When Push Comes to Shove Part A Two forces, of magnitudes F 85.0 N and F2 450 N act in opposite directions on a block, which sits atop a frictionless surface, as shown in the figure. (Figure 1) Initially, the center of the block is at position i -3.00 cm At some later time, the block has moved to the right, and its center is at a new position, 2 f 2.00 cm Find the work Wi Express your ans Wi= Figure 1 of 1 Submit Part B Find the work W2 Express your ans Submit Part C What is the net wo

Explanation / Answer

a)

here

work done = force * distance

w1 = 85 * ( 0.03 + 0.02 )

w1 = 4.25 J

b)

similarly

w2 = -45 * (0.03 + 0.02)

w2 = - 2.25 J

the negative sign use because the force is in opposite direction

c)

Wnet = w1 + w2

Wnet = 4.25 - 2.25 = 2 J

d)

Kf - Ki = Wnet

so

Kf - Ki = 2 J

the other way

F(net) = 85 - 45 = 40 N

then

F = m * a

a = 40 / m

v^2 = 2 * a * s

v^2 = 2 * (40/m) * (0.02 + 0.03)

use the formula of kinetic

KE = 0.5 * m * v^2

KE = 0.5 * m * ( 2 * 0.05 * 40 / m)

KE = 2 J

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