Which characteristic best distinguishes quantitative data from qualitative data? its validity

its repeatability

its ability to be graphed

its ability to be recorded

its ability to be graphed

Explanation:

A qualitative data essentially provides the outcome of an experiment in a descriptive manner. It cannot be measured but can only be observed. For example: color of a solution, texture of a metal etc.

In contrast, a quantitative data provides a numeric value to explain the outcome of an experiment. It can be measured using appropriate tools. The data can be analysed through graphs to model the behaviour of a certain experiment or to predict an outcome. For example: temperature, volume, weight are all quantitative data. In reaction kinetics for example, the change in concentration of reactants is monitored as a function of time. Both, concentration and time are quantitative data and can be plotted to deduce the order of a reaction.

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied