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A ball is droped from the top of the tower 100m high . simultaneously , another ball is thrown upward with a speed pf 50ms-¹ , After what time do they do thes cross each other ?
a) 1s
b) 2s
3) 3s
d) 4s
Anonymous:
t = 2s
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let the time aftr the start that they meet be x seconds
distance travelled by the ball falling from top=
s1=ut+1/2at2
here u is 0
so s1=1/2*10*x*x=5x2
now for the ball thrown up
s2=ut-1/2at2
s2= 50*x-5x2
s1+s2=100
5x2+50x-5x2=100
50x=100
x=2
so ur ans is option b=2s
distance travelled by the ball falling from top=
s1=ut+1/2at2
here u is 0
so s1=1/2*10*x*x=5x2
now for the ball thrown up
s2=ut-1/2at2
s2= 50*x-5x2
s1+s2=100
5x2+50x-5x2=100
50x=100
x=2
so ur ans is option b=2s
wlcm
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