Question

State the principle of conservation of energy. What is the relation between joule and erg? A car travelling with a velocity of 15 m/s speeds up to 30 m/s in 3 seconds. Calculte its acceleration.

Answer 1

Answer:

The principle of energy conservation states that energy is neither created nor destroyed. It may transform from one type to another.

The erg is a unit of energy equal to 10−7 joules (100 nJ). It originated in the centimetre–gram–second (CGS) system of units. It has the symbol erg.

5m/s2

Explanation:

Answer 2

Principle of Conservation of Energy -

According to the Principle Of Conservation of Energy , Energy can neither be created nor be destroyed, but it can be converted from one form to another form.

Relation between Joule and Erg -

The S.I unit of energy is joule, whereas the C.G.S unit of energy is erg .

So,

$1 J = 10^7 erg$

Given -

v = 15 m/s - 30 m/s

t = 3 s

a =?

Solution -

$acceleration = (30\ ms^-1 - 15ms^-1) / 3s\\\\ acceleration = 15 ms^-1/3 s\\\\acceleration = 5 ms^-2$