a window is 50 cm long.a stone is falling from height of 40 cm above the window.it crosses the window in?
1)3/7 sec
2)2/7 sec
3)1/7 sec
Ans:1/7 sec
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Answer:
Step-by-step explanation:
Given :
S1 = 40 cm = 0.4 m
S2 = 50 cm = 0.5 m
S=S1+S2 = 0.4+0.5 = 0.9 m = 9/10 m
a = 9.8 m/s2
uinitial = 0
Therefore from 2nd equation of motion ;
s= ut+ ½ ×at2
9/10 = 0×t + ½ × 9.8 × t2
9/10 = 0+4.9×t2
t = √9/√49
t = 3/7 seconds
modi1011:
bhai 1/7 answer 6e
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It is A wrong answer Plz click the heart
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