Motion In Two Dimensions Question 8
Question 8 - 01 February - Shift 1
A child stands on the edge of the cliff $10 m$ above the ground and throws a stone horizontally with an initial speed of $5 ms^{-1}$. Neglecting the air resistance, the speed with which the stone hits the ground will be $ms^{-1}$ (given, $g=10 ms^{-2}$ ).
(1) 20
(2) 15
(3) 30
(4) 25
Show Answer
Answer: (2)
Solution:
Formula: Third equation of motion
$v_y=\sqrt{2 g h}=\sqrt{200}$
$v _{\text{net }}=\sqrt{25+200}=15 m / s$
