Question

q.9. two 15 n forces in the same direction are acting on an object. what is the magnitude of the net force?
0 n
10 n
20 n
30 n
q.10. which of the following scientists is responsible for the three laws of motion?
leonardo da vinci
sir isaac newton
albert einstein
galileo galilei
q.11. which of the following box has more inertia?
3 kg
4 kg
5 kg
6 kg

Explanation:

Step1: Add forces in same direction

When two forces act in the same direction, the net - force is the sum of the two forces. Given two forces of 15 N each, the net - force $F_{net}=F_1 + F_2$.
$F_{net}=15+15$

Step2: Calculate the sum

$F_{net}=30$ N

For Q.10:

Sir Isaac Newton formulated the three laws of motion which describe the relationship between a body and the forces acting upon it, and its motion in response to those forces.

Inertia is directly proportional to mass. The greater the mass of an object, the greater its inertia. Among 3 kg, 4 kg, 5 kg and 6 kg boxes, the 6 - kg box has the largest mass.

Answer:

Sir Isaac Newton

For Q.11: