Question
Explain the need of irrigation in India.
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Briefly explain depletion of ozone layer and its effects.
Describe certain bacterial diseases of human beings.
Given alongside is the velocity-tine graph for a moving body:

Find:
A body of mass 2kg is thrown vertically upwards with an initial velocity of 20m/s. What will be its potential energy at the end of 2s? (Assume g = 10m/s2).
It has been observed that despite the availability of the vaccine for Hepatitis A in the market, it may not be necessary to be given to children by the time they are 5 years old. Why?