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A) From the given graph , we can see that ,from 0 to 20 seconds there is no change in the temperature of the block.

B) From the given graph , we can see that , the change in temperature was from 20 to 50 seconds ie. for (50-20) = 30 seconds.

C) From the given graph , we can see that, after heating for 50 seconds , the temperature became constant at 100°C.

D) From the given graph , we can see that , the temperature after 25 seconds was 20°C.

E) From the given graph , we can see that , the temperature after 50 seconds of heating remains constant at 100°C till infinite time. So we can say that the temperature after 1.5 minutes will be 100°C.