Applying a force of 5 newtons on a wooden plank with mass m₁ kg, it accelerates with an acceleration of 10 ms^-2. Another plank of mass m₂ kg accelerates with an acceleration of 20 ms^-2 when the same force is applied. If both the planks are tied with each other and the same force is applied on them, what will be the acceleration?

Newton's Third Law of Motion applies to which of the following situations?

A. When a person jumps from the boat to the river, the boat goes backwards

B. Passengers standing in a bus fall in the back direction, when the stationary bus suddenly moves

C. When a person falls on the cement floor, he gets hurt

D. While catching a fast moving cricket ball, a fielder puts his hands backwards

For every action there is an equal and opposite reaction. The law was given by

A. Newton

B. Albert Einstein

C. Bohr

D. Handane

Newton's second law of motion:

A. Explains the relationship between forces on two mutually effective objects

B. Also known by the law of inertia

C. It is helpful to understand the effects of force

D. Also known by the law of conservation of energy

When the car turns on a curved road, the passengers sitting in it feel a force on themselves in the opposite direction of the center, this force is due to . . . . . . . .

A. centrifugal force

B. inertia

C. centripetal force

D. gravitational force