JEE Main & Advanced
Physics
Motion in a Straight Line / सरल रेखा में गति
Question Bank
Motion Under Gravity
question_answer
A body freely falling from the rest has a velocity ?v? after it falls through a height ?h?. The distance it has to fall down for its velocity to become double, is [BHU 1999]
A) \[2h\]
B) \[4h\]
C) \[6h\]
D) \[8h\]
Correct Answer:
B
Solution :
Let at point A initial velocity of body is equal to zero
for path AB : \[{{v}^{2}}=0+2gh\] ?(i) for path AC : \[{{(2v)}^{2}}=0+2gx\] \[4{{v}^{2}}=2gx\] ?(ii) Solving (i) and (ii) \[x=4h\]