Question

The net external force on the propeller of a 3.0 kg model airplane is 6.8 N forward.What is the acceleration of the airplane? Answer in units of m/s^2.

Answer 1

The correct answer to the question is 2.27 $m/s^2$ i.e the acceleration of the body is 2.27 $m/s^2$ along the forward direction.

CALCULATION:

As per the question, the net external force on the propeller of model airplane F =  6.8 N.

The mass of the model air plane m = 3.0 kg

We are asked to calculate the acceleration of the air plane.

From Newton's second law of motion, we know that the net external force acting on a body is equal to the product of mass with acceleration of that body.

Mathematically force F = m × a

                                  ⇒  $a=\ \frac{F}{m}$

                                          $=\ \frac{6.8\ N}{3.0\ kg}$

                                          $=\ 2.27\ m/s^2$                  [ans]

The direction of acceleration is along the direction of force. Hence, the acceleration of the propeller is 2.27 $m/s^2$ along forward direction.