What's the height

Classical Mechanics Level 1

Calculate the height from which the ball Falls which takes it 1s to reach to ground

3.52m 3.105m 5.105m 4.905m

Atul Tarale by Atul Tarale , 29, India

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3 solutions

Jaivir Singh
Jun 27, 2014

S IS EQUAL TO 1/2 gt2

2 Helpful 0 Interesting 0 Brilliant 0 Confused

1/2 g time squre

pranoy mitra - 6 years, 11 months ago

Physics is getting harder and harder for me now...Just this question took me 5-6 minutes to solve because I had to work my way to x = -1/2*gt^2 by integrating v(t) etc. But, in high school I would have gotten the answer right away. :(

Jean Lille - 6 years, 11 months ago
Muhammad Hamza
Jul 24, 2014

second equation of motion tells us S= Vit +1/2 gt²

here Vi = 0 ms⁻¹ t=1 s
g=9.8 m/s²

putting the values

S = 0+1/2(9.8)1² S = 4.9m

1 Helpful 0 Interesting 0 Brilliant 0 Confused

i like this explanation... extra wow

Wabhatsha Jr. - 6 years, 10 months ago

Same method! : )

Athiyaman Nallathambi - 5 years, 11 months ago
Shounak Ghosh
Aug 10, 2014

S=1/2GT^2 Acc to prob, S=1/2x9.8x1=4.9=4.905m

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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