Something must be wrong in the data you have, since this is basic using of linear motion's formulas.
vf=v0+at. Where vf= final velocity; v0= initial velocity, a=acceleration and t=time.
If the rocket is initially at rest, v0=0. Therefore vf=at. Plugging numbers in gives 445=99*4.5, However
445≠445.5.
Check it and then calculate the distance from x=a*t^2.
Answer:
8 ms⁻¹
Explanation:
Kinetic energy is the energy possessed by a moving object solely due to its motion.
You can get the K.E. of an object using the equation,
K.E. = (1/2)mv²
So you get, for lorry,
K.E. = (1/2)4000×4² -----------(1)
for car,
K.E. = (1/2)1000×v²---------------(2)
(1)=(2)
(1/2)4000×4² = (1/2)1000×v²
y these two equations, we get, v = 8 ms⁻¹
Answer:
I₂ = 25 W / m²
Explanation:
Intensity is defined as the relationship between power and area
I = P / A
the power emitted by the sun is constant
P = I A
for the two points of interest
I₁ A₁ = I₂ A₂
energy is distributed on the surface of a sphere
A = 4π R²
I₁ R₁² = I₂ R₂²
I₂ =
let's calculate
I₂ =
I₂ = 25 W / m²
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