A ball 'X' is thrown vertically upwards with speed u. At the same instant, another ball 'Y' is released from rest at a height H. At time t (before any ball hits the ground), the speed of 'X' relative to 'Y' is:

The Dandi March, also known as the Salt Satyagraha, was led by which influential leader?

Which act formally granted independence to India, marking the end of British rule?

Who was the key figure in establishing the Indian National Congress?