Galileo Galilei was an Italian astronomer, physicist and an engineer. He was born on 15 february 1564 in Pisa, Italy.He is considered as father of modern science.In 1586, he wrote his first scientific book ‘The Little Balance. He gave his theories about falling objects using an inclined plane to slow down the rate of descent. He formulated the correct law for uniformly accelerated objects that the distance the object moves is proportional to the square of the time taken.

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Metre is the unit of which quantity?