Explanation:
A ball is thrown straight upward and falls back to Earth. It means that it is coming to the initial position. Displacement is given by the difference of final position and initial position. The displacement of the ball will be 0. As a result velocity will be 0.
Acceleration is equal to the rate of change of velocity. So, its acceleration is also equal to 0.
Hence, displacement, velocity and acceleration are zero.
Well,
We know that microwaves and infrared waves (C and D) have longer wavelengths than visible light.
We know that UV light will give you a sunburn if you get too much of it.
Therefore, UV light has more energy, and thus a shorter wavelength than visible light.
Option B is the correct answer.
Answer:
It took the rock 2 seconds to get to the water from the bridge.
Explanation:
Since Forrest drops the rock, it means its initial velocity is zero, and because it is freely falling under the influence of gravity, after time it will gain a velocity of
,
solving for we get:
Since in our case the velocity the rock gained was and the acceleration due to gravity is , we have
Thus, the time took the rock to reach the water from the bridge was 2 seconds.
Answer:
0.5 m/s
Explanation:
From Newton's Third law of motion,
Momentum of the cannon = momentum of the flatcar.
mv = MV........................ Equation 1
Where m = mass of the cannon, v = velocity of the cannon, M = mass of the flatcar, V = Velocity of the flat car.
make V the subject of the equation
V = mv/M................... Equation 2
Given: m = 10 kg, v = 50 m/s, M = 1000 kg
Substitute into equation 2
V = 10×50/1000
V = 500/1000
V = 0.5 m/s
Hence the speed of the flatcar = 0.5 m/s
It looks like a refractor.