Question
A 20 N ball and a 40 N ball are dropped at the same time from a height of 10 meters. Air resistance is negligible. Which of the following statements is accurate? After 1 second has elapsed, both balls have the same kinetic energy, since they the same acceleration. The heavy ball has a greater acceleration and fails faster. Both balls the ground at the same time but gravity does work on the heavy ball than on the light ball. The light ball has a greater speed, since it can accelerate faster than the heavy ball. If an object has a larger potential energy than kinetic energy. the speed of the object will increase. the speed of the object will not change. the speed of the object will decrease. it is not possible to predict what the speed will be; it depends on the situation. When you lift a heavy 5.0 kg crate straight up from ground level to a height of 2.0 m above ground level, then you have changed the crate's gravitational potential energy by 98 m^2/s^2 98 L an undetermined amount, because it depends on how fast you lifted it 98 N 98 kg m/s. The potential energy of a spring is 0.3 J when it is compressed 0.04 m to the left of its equilibrium position. At this point it comes to its leftmost position. What is its kinetic energy at this point? -0.3 J zero 0.3 J 375 N/m For a 0.1 kg frog to jump to a height of 1.0 meter requires an energy of about 10 joule. 1.0 joule. 0.5 joule. 0.1 joule.
Explanation / Answer
Question:
A 20 N ball and a 40N ball are dropped at the same time from a height of 10 meters. Air resistance is negliglible. Which of the following statements is accurate?
A. After 1 second has elapsed, both balls have the same kinetic energy, since they have the same acceleration
B.The heavy ball has a greater acceleration and falls faster.
C. Both balls hit the ground at the same time but does more work on the heavy ball than on the light ball.
D. The light has a greater speed, since it can accelerate faster than the heavy ball
Answer
c. the two balls hit the ground at the same time
because accelration due to gravity does not depends on the mass
it is constant
so, both have same speed and hit the ground at the same time
However, more mass=more energy
