Sunlight contains seven colours, viz violet, indigo ,blue, green, yellow, orange and red. The leaves appear green because they absorb all the colours and reflect green as green colour is least used in photosynthesis. This green colour reaches our eyes. Hence leaves appear green.
Which is always constant for a machine of given design: MA or VR ? Ans: VR remains constant for a machine of given design as it depends on the distances moved by the load and effort but MA can vary due to the friction developed between the moving parts of the machine.
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