Answer:
B
Explanation:
Newton's first law of motion states that a body will remain in its state of rest or if its in motion will continue to move in a straight line, unless its acted upon by an external force.The ability of an object to stay at rest or in motion if its in motion is known as inertia.
Hence the correct option is B.
Answer:
true,true,false
Explanation:
its false because if it is equal it would show an arrow pointing left and a 20 and the same for the right
I don't understand the question but impulse and momentum is the same. So maybe is the force same too
Answer:
80%
Explanation:
![efficiency = \frac{useful \: work \: done}{total \: energy \: input}](https://tex.z-dn.net/?f=efficiency%20%3D%20%20%20%5Cfrac%7Buseful%20%5C%3A%20work%20%5C%3A%20done%7D%7Btotal%20%5C%3A%20energy%20%5C%3A%20input%7D%20)
800 / 1000 = 0.8
Efficiency = 0.8 *100 = 80%
Answer:
Nowadays most of our works are being done through different types of energy which are non-renewable. People are wasting lot of energy (hydel, dolar etc.) due to which in future we can face energy crisis.