From a hot air balloon that is at rest at a certain height, a projectile is launched horizontally at 30m / s, how fast will it h

Question

3 years ago

15

ave after 4s?
A. 50m / s
B. 60m / s
C. 70m / s
D. 80m / s

2 answers:

stepan [7] · Answer 1 · 2022-08-01T04:35:35+03:00

stepan [7]3 years ago

4 0

The answer:

A) 50 m/s

Yuki888 [10] · Answer 2 · 2022-08-01T02:34:32+03:00

Yuki888 [10]3 years ago

3 0

Answer:

A. 50 m/s

Explanation:

Given in the y direction:

v₀ = 0 m/s

a = 10 m/s²

t = 4 s

Find: v

v = at + v₀

v = (10 m/s²) (4 s) + 0 m/s

v = 40 m/s

In the x direction, the velocity is constant at 30 m/s.

The overall speed is:

v² = (30 m/s)² + (40 m/s)²

v = 50 m/s