A500 kg car is accelerated from rest by a force of 2000 n for a displacement of 400m. what is the speed of the car at the end of 400 m?

57 m/s

Explanation:

Use Newton's second law to find the acceleration.

F = ma

2000 N = (500 kg) a

a = 4 m/s²

Given:

Δx = 400 m

v₀ = 0 m/s

a = 4 m/s²

Find: v

v² = v₀² + 2aΔx

v² = (0 m/s)² + 2 (4 m/s²) (400 m)

v ≈ 57 m/s

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )