Work Rate of Force on Block of 102 kg at 5.5 m/s

[Arman777]

Homework Statement

Across a horizontal floor,a $102 kg$ block is pulled at a constant speed of $5.5\frac {m} {s}$ by an applied force $125N$ directed $38^°$ above the horizontal.Calculate the rate at which the force does work on the block.

Homework Equations

$W=ΔE_k$
$E_k=\frac 1 2 mv^2$

The Attempt at a Solution

I didnt understand the question.Whats does the Calculate the rate at which the force does work on the block means.Net work must be zero cause object moves in constant speed.So there must be a fricition maybe ?

Thanks

 

[SammyS]

Homework Statement

Across a horizontal floor,a $102 kg$ block is pulled at a constant speed of $5.5\frac {m} {s}$ by an applied force $125N$ directed $38^°$ above the horizontal.Calculate the rate at which the force does work on the block.

Homework Equations

$W=ΔE_k$
$E_k=\frac 1 2 mv^2$

The Attempt at a Solution

I didn't understand the question.What does the Calculate the rate at which the force does work on the block means.Net work must be zero cause object moves in constant speed.So there must be a friction maybe ?

Thanks

The net work done is indeed zero, which can be seen because the speed is constant. As you say, there must be some other force.

But the question does not ask about the work done by the net force. It asks for the rate of work done by the 125 N force.

 

[Arman777]

Thanks I solved