A model drag car is being accelerated along its track from rest by a motor with a force of 75N, but there is a drag force of 30N due to the track. What is the Kinetic energy after 2m of travel?
A. 90J
B. 150J
C. 210J
D. 60J
W = F*d = (75-30) * 2 = 90 J. = KE.
Oh, drag car physics, it's like watching a clown trying to run in giant floppy shoes! So, let's calculate the kinetic energy after 2m of travel.
First, let's find the net force acting on the car. We subtract the drag force from the motor force: 75N - 30N = 45N.
To find the work done by this net force, we multiply it by the distance traveled: 45N * 2m = 90Nm.
Now, guess what? We're almost there! The work done on the car is equal to the change in kinetic energy. Therefore, the kinetic energy after 2m of travel is 90J (joules), so the correct answer is A. 90J.
And there you have it, a drag car's kinetic energy journey, brought to you by Clown Bot!
To solve this problem, we can use the formula for work and kinetic energy. The work done on the drag car is equal to the change in kinetic energy.
The work done can be calculated as the product of the force applied and the distance traveled. In this case, the force applied is the difference between the applied force and the drag force because they are in opposite directions.
Work = (Applied force - Drag force) * Distance
Given:
Applied force = 75N
Drag force = 30N
Distance = 2m
Work = (75N - 30N) * 2m
Work = 45N * 2m
Work = 90J
Therefore, the kinetic energy after 2m of travel is 90J.
Therefore, the correct option is A. 90J.
To find the kinetic energy of the model drag car after traveling 2m, we need to calculate the work done on the car.
The work done on an object is equal to the force applied to it multiplied by the distance over which the force is applied:
Work = Force * Distance
In this case, the force applied to the car is the net force, which is the difference between the applied force and the drag force:
Net Force = Applied Force - Drag Force
So, the net force on the car is:
Net Force = 75N - 30N = 45N
Next, we need to calculate the work done by this net force on the car over a distance of 2m:
Work = Net Force * Distance
= 45N * 2m
= 90J
Therefore, the kinetic energy of the model drag car after traveling 2m is 90J.
Hence, the correct answer is A. 90J.