Answer:
A. usually 3 cards a year means you have little or no credit I believe
I would think 10 but I would have to see the picture
<span>Mass of rock 1 is m1 = 10 kg Mass of rock 2 is m2 = 20 kg 10-kg rock takes T (the same time ) to reach the ground as similar to 20-kg rock that takes time T to reach the ground. If no air resistance is present, the rate of descent depends only on how far the object has fallen, no matter how heavy the object is. This means that two objects will reach the ground at the same time if they are dropped simultaneously from the same height. This statement follows from the law of conservation of energy and has been demonstrated experimentally by dropping a feather and a lead ball in an airless tube.
When air resistance plays a role, the shape of the object becomes important. THUS 10-KG & 20-KG ROCK reaches the ground in T-time</span>
Answer:
Earth's tilted axis causes the seasons.
Explanation:
Answer:
y = 3.159 m
Explanation:
Using the second equation of motion.
s = ut + 0.5at^2 .......1
Since the ball is thrown upward the acceleration due to gravity act against it.
Given:
distance s = y
Initial speed u = 12.0 m/s
Time t = 0.30 s
Acceleration a = -g = -9.8m/s^2
Equation 1 becomes;
y = ut - 0.5at^2
Substituting the given values. We have;
y = 12.0(0.30) - 0.5(9.8 × 0.3^2)
y = 3.6 - 0.441
y = 3.159 m
