We have no way to calculate that, unless you also tell us either his mass, or else
his weight on motionless ground, like when the scale is on the bathroom floor.
The 40kg student's force (weight) on Earth is about 392.28 newtons. (Force = mass x acceleration). Earth's acceleration is 9.807 meters per second squared.
As always, that's going to depend on where he is. Wherever it is, the forces of gravity between him and another nearby mass will both be (45 kg) x (acceleration of gravity in the vicinity of the other mass). If the other mass is the Earth, then the acceleration of gravity is 9.8 m/s2 , and the force, which the student will call his 'weight', is (45) (9.8) = 441 newtons (99.21pounds / 7stone 1.21pounds)
F = M A In order for a 40-kg mass to accelerate at 2 meters/sec2 , a force of (40 x 2) = 80 newtons has to come from somewhere. That force is what produces that acceleration.
If each student is pushing with a force of 50 newtons in opposite directions, the net force will be the difference between the forces, which would be 0 newtons since they are equal and opposite. So, the net force on the box would be 0 newtons.
When a student pushes a tree and it does not move, the force applied by the student (10 newtons in this case) is equal and opposite to the static friction force between the tree and the ground. This static friction force prevents the tree from moving.
The 40kg student's force (weight) on Earth is about 392.28 newtons. (Force = mass x acceleration). Earth's acceleration is 9.807 meters per second squared.
16.7 m/s²
As always, that's going to depend on where he is. Wherever it is, the forces of gravity between him and another nearby mass will both be (45 kg) x (acceleration of gravity in the vicinity of the other mass). If the other mass is the Earth, then the acceleration of gravity is 9.8 m/s2 , and the force, which the student will call his 'weight', is (45) (9.8) = 441 newtons (99.21pounds / 7stone 1.21pounds)
F = M A In order for a 40-kg mass to accelerate at 2 meters/sec2 , a force of (40 x 2) = 80 newtons has to come from somewhere. That force is what produces that acceleration.
Student in the bathroom
If each student is pushing with a force of 50 newtons in opposite directions, the net force will be the difference between the forces, which would be 0 newtons since they are equal and opposite. So, the net force on the box would be 0 newtons.
When a student pushes a tree and it does not move, the force applied by the student (10 newtons in this case) is equal and opposite to the static friction force between the tree and the ground. This static friction force prevents the tree from moving.
The weight of a 40 kg student on Earth can be calculated using the formula W = mg, where W is the weight, m is the mass, and g is the acceleration due to gravity (g = 9.81 m/s^2). Plugging in the values, the weight of a 40 kg student on Earth would be approximately 392.4 N.
If a student had a mass of 195 kg, then his weight on earth was 1,911 newtons, or about 430 pounds.
If you are a typical high-school student, step on a bathroom scale and note your weight. Now, divide that number by the acceleration of gravity on the Earth. (On the surface of the Earth, it's 32.2 feet per second squared.) The resultant value will be your mass in slugs.
A student with a mass of 90 kg on the earth (gravity =9.8m/s/s) will have a weight of 882 Newtons. Weight = Mass * Gravity
The 40kg student's force (weight) on Earth is about 392.28 newtons. (Force = mass x acceleration). Earth's acceleration is 9.807 meters per second squared.