Answer:
Apply Newton's second law in the moving direction.
Explanation:
Friction force applies in the opposite direction of motion; as a restriction.
Answer:
Radioactive decay is the spontaneous breakdown of an atomic nucleus resulting in the release of energy and matter from the nucleus. Remember that a radioisotope has unstable nuclei that does not have enough binding energy to hold the nucleus together.
Explanation:
B 30 kg because
One quarter =1/2
Kg=60
1/2 of Kg
1/2*60
30 kg
An Active solar energy system because it uses the sun to heat up the green house an I’m return the plants grow an produce food
