Question

A metal ball of mass 5kg falls from a height of 490 m. How much time it will take to reach the ground? (g=9.8m/s2​

Answer 1

Answer:

24010 seconds

Explanation:

Potential Energy = Mass*Gravitational pull*Height

Given

Mass = 5kg, Gravitational pull = 9.8 and Height = 490m

We know that P.E = mgh = 5*9.8*490 = 24010sec

Answer 2

Answer:

10s

Explanation:

initial velocity of metal ball=u=0

displacement travelled by metal ball=s=490

use formula,

s=ut+1/2at square

490=0*t+1/2*g*t square

490=1/2*9.8*t square

490=4.9t square

t square =100

t =10s

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