Answer:
The Earth is 4.543 billion years old
A because light is the fastest thing on this earth
Answer:
Kinetic energy, K = 14.97 J
Explanation:
We have,
Mass of the object, m = 5.2 kg
Velocity of the object, v = 2.4 m/s
It is required to find the kinetic energy of the object. As it is moving with some velocity, it will have kinetic energy. It is given by :
So, the kinetic energy of the object is 14.97 J.
Answer: 8.43 m
Explanation:
Given
Mass of the rocket, m = 600 g = 0.6 kg
Speed of riling, v = 2.5 m/s
F = mg, where
F = weight of the rocket in N
m = mass of the rocket in kg
g = acceleration due to gravity in m/s²
F = 0.6 * 9.8
F = 5.88 N
Since the the vertical thrust on the rocket is 8 N and 5.88 N of it will be used to counter the rockets weight. Thus, the remaining 2.12 N is what is available to provide acceleration.
Upward acceleration of the rocket is..... F = ma, a = F / m
a = 2.12 / 0.6
a = 3.53 m/s²
using equation of motion, we will calculate how long it will take to rise 20 m in the air
S = ut + 1/2at², where u = 0
20 = 1/2 * 3.53 * t²
t² = 4. / 3.53
t² = 11.33
t = √11.33 = 3.37 s
The distance then is
v = Δx / t, such that
Δx = v * t
Δx = 2.5 * 3.37
Δx = 8.43 m
B: Sprinting. It is the best answer because it demonstrates speed better than the others
