iv. Identify solution b. In an experiment to compare thermal conductively of different materials such as iron, lead, aluminum, copper and wood, the diagram below was used. The arrows on the rocks indicate the extent at which the vaseline applied around the material melted when heat is applied Study it carefully and answer the questions that follow. Hot water Vaseline applied on the material T V TU IN 1 i. Identify each of the materials labeled I, II, III, IV and V using the melting level of the vaseline. ii. Which material had the least melting of the vaseline? 2marks iii. Give one reason for your answer in (ii) above 1mark iv. Arrange the materials in order of decreasing conductivity of heat 5 marks v. Mention two modes of heat transfer in this experiment 2 marks​

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.