Answer:
3 m/s
Explanation:
First, find the time it takes to land.
Given in the y direction:
Δy = 0.8 m
v₀ = 0 m/s
a = 10 m/s²
Find: t
Δy = v₀ t + ½ at²
0.8 m = (0 m/s) t + ½ (10 m/s²) t²
t = 0.4 s
Next, find the velocity needed to travel 1.2 m in that time.
Given in the x direction:
Δx = 1.2 m
a = 0 m/s²
t = 0.4 s
Find: v₀
Δx = v₀ t + ½ at²
1.2 m = v₀ (0.4 s) + ½ (0 m/s²) (0.4 s)²
v₀ = 3 m/s
Answer: 5.21 s
Explanation:
Given
Helicopter ascends vertically with
Height of helicopter
When the package leaves the helicopter, it will have the same vertical velocity
Using equation of motion
So, package will take 5.21 s to reach the ground
The answers for this question are:
a. You push a box until it moves. = unbalanced
b. You push a box but it doesn't move. = balanced
c. <span>You stop pushing a box and it slows down. = unbalanced
As a general explanation for all the items, forces are considered balanced when they cancel each other out. This means that no net force is produced. A and C are unbalanced because one force was able to overcome the force exerted by the object.</span>
C is the only right answer in this
Answer:
t = 14 s
Explanation:
First, we need to find the acceleration of the meteor by using Newton's s Second Law, as follows:
where,
F = Unbalanced Force = 100000 N
m = mass of meteor = 70 kg
a = acceleration of meteor = ?
Therefore,
a = -1428.57 m/s² (negative sign de to deceleration)
Now, we use general formula of acceleration to find time:
where,
t = time taken = ?
Δv = change in speed = 0m/s - 20000 m/s = - 20000 m/s
Therefore,
<u>t = 14 s</u>