Question

rock a is thrown horizontally off of a cliff with a velocity of 20 m/s. the rock lands 60 m from the base of the cliff. refer to the above information and diagram. what is the magnitude of velocity for the horizontal component just before rock a strikes the ground? 0 m/s 9.8 m/s 44.1 m/s 20 m/s multiple choice 1 point rock a is thrown horizontally off of a cliff with a velocity of 20 m/s. the rock lands 60 m from the base of the cliff.

Explanation:

Step1: Analyze horizontal - motion property

In horizontal - direction of projectile motion, there is no acceleration ($a_x = 0$) if air - resistance is neglected.

Step2: Determine horizontal velocity

The horizontal velocity $v_x$ remains constant throughout the motion. Given the initial horizontal velocity $v_{0x}=20$ m/s, and since $v_x = v_{0x}$ (because $a_x = 0$), the horizontal component of velocity just before the rock strikes the ground is also 20 m/s.

Answer:

20 m/s