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The rifle and bullet have zero momentum and zero kinetic energy to start with. When the trigger is pulled, the bullet gains some momentum in the forward direction, but this is canceled by the rifle's backward momentum, so the total momentum is still zero. The kinetic energies of the gun and bullet are both positive scalars, however, and do not cancel.
In photosynthesis, what does ATP stand for?
Which Gland of the Human body secretes Melatonin?
Red rot of Sugarcane is caused by
Which one of the following is not a Vitamin?
Which hormone is essential for regulating blood sugar levels in humans?
The term 'Pseudopodia' is associated with which type of organism?
Which of the following disease is caused by the deficiency of iodine in food?
Which of the following is not classified as a Bio-fertilizer?
Foramen Magnum is an aperture of
Which Acid is known as ‘Oil of Vitriol’?