Question

Bob is pushing a 25.00 kg sled up a 20.00° slope starting from rest. If he...

Bob is pushing a 25.00 kg sled up a 20.00° slope starting from rest. If he pushes with an average force of 90.00 N for 3.00 m up the slope, how fast will the sled be moving (ignoring friction and air resistance)?

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Answer #1

Let the direction up the ramp be x-axis and direction perpendicular to this be y-axis

Here F is the applied Force is positive x-axis = 90 N

Fn is the Normal Force in positive y-axis

Wx is the x component of weight of the block in negatice x-axis

Wy is the y component of the weight of the block in negative y-axis

a be the acceleration in positive x-axis direction

s be the distance that the sled will move = 3m

u be the initial velocity and v be the final velocity of sled = 0 m/s

In x-axis direction

m isthe mass of the sled

By equatin of Motions :

The sled will be moving with 1.225 m/s

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