Question 51: Motion in 2D & Vectors

Question

A child stands on the edge of the cliff $$10 \mathrm{~m}$$ above the ground and throws a stone horizontally with an initial speed of $$5 \mathrm{~ms}^{-1}$$. Neglecting the air resistance, the speed with which the stone hits the ground will be $$\mathrm{ms}^{-1}$$ (given, $$g=10 \mathrm{~ms}^{-2}$$ ).

Accepted Answer

$$
\begin{aligned}
& \mathrm{v}_{\mathrm{y}}=\sqrt{2 g h}=\sqrt{200} \\
& v_{n e t}=\sqrt{25+200}=15 \mathrm{~m} / \mathrm{s}
\end{aligned}
$$

Answer

20

Answer

25

Answer

30

Answer

15

Motion in 2D & Vectors

A child stands on the edge of the cliff $10 \mathrm{~m} above the ground and throws a stone horizontally with an initial speed of 5 \mathrm{~ms}^{-1}. Neglecting the air resistance, the speed with which the stone hits the ground will be \mathrm{ms}^{-1} (given, g=10 \mathrm{~ms}^{-2}$ ).

Choose the correct answer: