science for 2nd grade

The ball covers 10 m in every 2 seconds. The speed with which the ball is moving at any point between A and E is 5 m/s. The object is moving with uniform spee..

Question: A boy fires a gun and hears the echo 2 seconds later. If he is 480 m away from a wall, calculate the velocity of sound in air. Answer: v = = = 480 m s - 1..

A frame of reference is another object or scene with respect to which we compare an object's position. Example for Frame of Reference: Figure 1 Figure 2 Look at the figures. In figure1, the car is to the right of t..

forming the colourless soluble salt zinc sulphate and hydrogen gas. Zn (s) + H 2 SO 4(g) ZnSO 4(s) + H 2(g) (this reaction is catalysed by adding a trace of copper sulphate solution) Zinc can be extracted by reducing the hot metal oxide on heating with carbon 2ZnO (s) ..

Matter In Our Surroundings - Matter can be defined as anything that occupies space, (i.e., has a volume), possesses mass, offers resistance and can be felt through one or more of our sense..

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