Why is LPG considered as a good fuel

Liquefied Petroleum Gas is considered a good fuel because of the following reasons: ... The calorific value of LPG is about 50 kj/g. ✦ It is a very neat and clean domestic fuel. It burns with a smokeless flame and hence does not cause pollution.

Displacement = 0

Explanation:

Displacement can be defined as the straight line path distance between starting and final position.

The fog starts at 0 add moves 18 cm. Then moves 6 cm backwards and then another 12 cm backwards.

It is a vector quantity. We will take forward direction as positive and backward as negative

Displacement = 0 + 18 cm -6 cm - 12 cm = 0

Hence, the frog's displacement is 0 which means that frog came back to its initial position.