Author Question: A high-speed dart is shot from ground level with a speed of 150 m/s at an angle 30 above the ... (Read 115 times)

michelleunicorn · **on:** Jul 29, 2018

A high-speed dart is shot from ground level with a speed of 150 m/s at an angle 30 above the horizontal. What is the vertical component of its velocity after 4.0 s if air resistance is neglected?

A) 130 m/s B) 150 m/s C) 38 m/s D) 36 m/s E) 75 m/s

Question 2

A 3.0-kg brick rests on a perfectly smooth ramp inclined at 34 above the horizontal. The brick is kept from sliding down the plane by an ideal spring that is aligned with the surface and attached to a wall above the brick.

The spring has a spring constant (force constant) of 120 N/m. By how much does the spring stretch with the brick attached?
A) 36 cm B) 360 cm C) 24 cm D) 14 cm E) 240 cm

raili21 · **Reply #1 on:** Jul 29, 2018

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