A body at rest is given an initial acceleration of 6m/s² for 20 seconds, after which the acceleration is reduced to 4m/s² for the next 10seconds. The body maintains the speed attained for 30seconds. Draw the velocity time graph for the motion using the information given above. From the graph calculate; 1. Maximum speed attained during the motion
2. Total speed attained during the first 30seconds
3. Average speed during the time interval as in no. 2

Within a pendulum, as potential energy decreases, energy increases. a. heat b. kinetic c. frictional d. gravitational

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length (in m) of a column of water 1.45 km high for a temperature increase of 1.12°c. assume the column is not free to expand sideways. as a model of the ocean, that is a reasonable approximation, as only parts of the ocean very close to

Why does karst topography exist in some geographic location? a. few climates have enough oxygen b. most regions have rock layers other than limestone c. in most regions, the soil is too thin d. the water is too acidic enough in most places