Question

An object is placed on a rough surface.External forces of 20N is acting on the body and 10N frictional force is acting on the body.find(1).the net force on object
(2). Velocity of object after 2 seconds if the object is started from rest.
(3).Acceleration of object if mass of object is 2 kg.








Find the correct answer with explanation.
(Hint:It is a question from class 9 reference book)​

Answer 1

Answer:

1. F net = 20 N - 10 N = 10 Newton.

3. a = F net/ Mass= 10/ 2 = 5 m sec-^2

2. V = u + axt= 5x 2 = 10 m /Sec

Answer 2

Answer:

1). 10N

2). 5m/s^2

3). 10m/s

Explanation:

External forces are those brought on by anything outside the system. Internal forces are the forces that the system's objects transfer. External forces are those that are exerted on a building from outside of it. Loads, such as the weight of the building itself and the non-structural elements it carries, and live loads, such as moving loads like people, objects, and furniture, as well as wind loads, seismic loads, and impact loads, among others, are examples of external pressures. An additional type of external force is a response force caused by external at the places where a conventional methods is sustained.

1. 20 N of external forces are exerted on the body.

Frictional force of 10N is exerted on the body.

          $= 20 N - 10 N$

          $= 10 Newton.$

2. $a=\frac{Fnet}{Mass}$

      $=\frac{10}{2}$

      $=5msec^{2}$

3. $V = u + axt$

       $= 5 * 2$

       $= 10 m /Sec$

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