A car of mass 800kg attains a speed of 25ms-1 in

Question

20 seconds. The power developed in the energy is
A. 1.25 x 104 W
B. 2.50 x 104W
C. 1.25 x 106 W
D. 2.50 x 106 W

Answer 1

To find the power developed in the car, we can use the equation:

Power = Force x Velocity

The force acting on the car can be found using Newton's second law:

Force = Mass x Acceleration

We can find the acceleration using the formula:

Acceleration = (Final Velocity - Initial Velocity) / Time

Plugging in the given values:

Acceleration = (25 m/s - 0 m/s) / 20 s = 1.25 m/s^2

Plugging in the mass and acceleration values into the force equation:

Force = 800 kg x 1.25 m/s^2 = 1000 N

Finally, plugging the force and velocity values into the power equation:

Power = 1000 N x 25 m/s = 25000 W

Therefore, the power developed in the car is 2.50 x 104 W. The correct answer is B.