Let's set the upwards direction to be positive and the downwards direction to be negative.
Since we do not know the final velocity of the ball right before it hits the ground, we will use our knowledge that the final velocity of the ball is 0 m/s right before it changes direction to fall back to the ground.
a = -9.8 m/s²
Δy = 100 ft
v = 0 m/s
v₀ = ?
Find what constant acceleration equation contains all four variables.
v² = v₀² + 2aΔy
Substitute the known variables into the equation and solve for v₀, the initial velocity.
Let's set the upwards direction to be positive and the downwards direction to be negative.
Since we do not know the final velocity of the ball right before it hits the ground, we will use our knowledge that the final velocity of the ball is 0 m/s right before it changes direction to fall back to the ground.
a = -9.8 m/s²
Δy = 100 ft
v = 0 m/s
v₀ = ?
Find what constant acceleration equation contains all four variables.
v² = v₀² + 2aΔy
Substitute the known variables into the equation and solve for v₀, the initial velocity.
Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.
Image formed by a plane mirror is always virtual which means that the light rays do not actually come from the image but upright and these of the same shape and size are the object it is<span> reflecting.</span>
