Question

An unbalanced force is applied to accelerate the object to a final kinetic energy of 400.0 J. What is the change in the object's speed?

Answer 1

Step-by-step explanation:

Assuming the mass of the object remains constant, we can use the formula for kinetic energy:

KE = (1/2)mv^2

where KE is the final kinetic energy, m is the mass of the object, and v is the final speed.

Let's rearrange the equation to solve for v:

v = sqrt(2KE/m)

We don't know the mass of the object, but we can use the formula for force:

F = ma

where F is the net force applied to the object, m is the mass of the object, and a is the acceleration.

We can rearrange this equation to solve for the mass:

m = F/a

Now we can substitute this expression for mass into the formula for final speed:

v = sqrt(2KE/(F/a))

v = sqrt(2aKE/F)

We don't know the value of the force or the acceleration, so we can't calculate the final speed.