First, calculate how long the ball is in midair. This will depend only on the vertical displacement; once the ball hits the ground, projectile motion is over. Since the ball is thrown horizontally, it originally has no vertical speed.
t = time vi = initial vertical speed = 0m/s g = gravity = -9.8m/s^2 y = vertical displacement = -45m
y = .5gt^2 [Basically, in this equation we see how long it takes the ball to fall 45m] -45m = .5 (-9.8m/s^2) * t^2 t = 3.03 s
Now we know that the ball is midair for 3.03s. Since horizontal speed is constant we can simply use:
x = horizontal displacement v = horizontal speed = 25m/s t = time = 3.03s
x = v*t x = 25m/s * 3.03s = 75.76 m Thus, the ball goes about 75 or 76 m from the base of the cliff.
Answer:
filament bulb, filament lamp
Explanation:
weight = mg
W on earth = 800N
mg = 800 N
m(9.8 m/s²)= 800N
dividing 9.8 both sides
m=800/9.8 ( as g=9.8m/s² on earth)
m=81.63 kg
Now weight on Mars
w=mg
=(81.63kg) ×(3.76m/s²)
w=306N
Answer:
D.
Explanation:
The crest of a wave refers to the highest point of a wave. This is illustrated by D.
