Question

3.
A block of weight 9.8 N is placed on a table. The table surface exert an upward force of
10 N on the block g = 9.8 m/s.
I
(A) Block exerts a force of 10 N on the table
(B) Block exerts a force of 19.8 N on the table
(C) Block exerts a force of 9.8 N on the table
(D) The block has an upward acceleration.

Answer 1

Answer :

(A) Block exerts a force of 10 N on the table

(D) The block has an upward acceleration.

Both Option A & D are correct !

Step-by-step explanation :

Option A is obviously correct as it itself states that the Block exerts a force of 10 N on the table . [Given]

Let's understand Newton's 3rd Law to know about the actual answer. As Newton's 3rd Law states that, every action has an equal and opposite reaction.

The above force is exerted on the block by table which is equal to that of the force exerted by block on the table. So, block exerts a force of 10 N on the table .

As the upward force on the block is larger than downward force, it moves upwards ,i. e., the block has an upward acceleration.

Additional information :

1. Every object in uniform motion will remain same unless an external force is applied on it .

2. Force is equal to that of the product of mass and acceleration .

3. For every action there is an equal and opposite reaction.