an object is projected upwards with a velocity of 100m/s. it will strike the ground after how many seconds?
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The object comes back to its initial position. So its displacement is zero.
Now take initial velocity=100m/s and acceleration=-g.
Use the formula s=ut+1/2at^2
So 0=100t - 1/2gt^2
200t-gt^2=0
t(200-gt)=0
Implies that t=0 or 200-gt=0
So t=0 or 200/g
If we take g=10
t=0,20
So obviously object is initially at ground, it is on ground after 20sec.
Now take initial velocity=100m/s and acceleration=-g.
Use the formula s=ut+1/2at^2
So 0=100t - 1/2gt^2
200t-gt^2=0
t(200-gt)=0
Implies that t=0 or 200-gt=0
So t=0 or 200/g
If we take g=10
t=0,20
So obviously object is initially at ground, it is on ground after 20sec.
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