Question

a stone is dropped from a tower 180m high. How long does it take to reach the ground what is its velocity when it touches the ground

Answer 1

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Answer 2

  We know that    

        s = ut + 1/2a t²

       ⇒180 = 0 + (1/2)(10)t²

       ⇒180 = 5  t²

       ⇒180/5 = t²

       ⇒36  = t²

       ⇒√36 = t

       ⇒t = 6

∴Time taken is 6 seconds