Q.
Identical guns fire identical bullets horizontally at the same speed from the same height above level planes, one on the Earth and one on the Moon. Which of the following three statements is/are true?I. The horizontal distance travelled by the bullet is greater for the Moon.II. The flight time is less for the bullet on the Earth.III. The velocities of the bullets at impact are the same.
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a
III only
b
I and II only
c
I and III only
d
II and III only
answer is B.
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Detailed Solution
The figure can be represented as follows:The expressions areh=12gt2;t=2hg;x=ut=2hgu or t∝1g;x∝1gFor moon, gmoon =g6, substituting in Eq. (1) and comparing, we gettMoon =6t>tEarth ,xMoon =6x>xEarth Hence, Statements I and II both are correct. Now, vx = u, sovy=gt=g2hg=2gh or v∝g. Since gMoon =g/6, we have vMoon
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