Answer:
The maximum height reached by the ball is 20 meters
Explanation:
Given that,
Height, h = 10 m
Potential energy at the height of 10 m,
The ball is moving upward with a kinetic energy of 50 Joules
Let h is the maximum height reached by the ball. At a height of 10 meters above the ground, the energy is given by :
mg = 5 N
At this point, total energy will be 100 J. We know that the velocity is zero at maximum height. So, the ball possess only potential energy. it is given by :
h = 20 meters
So, the maximum height reached by the ball is 20 meters. Hence, this is the required solution.
Answer:
The average force exerted by the person on the box is 20 N.
Explanation:
Given that,
Impulse applied to the box, m = 5 kg-m/s
Time of contact of the person with the box is 0.25 seconds. We need to find the average force exerted by the person on the box. The impulse applied on an object is given by :
F is the average force exerted by the person on the box
F = 20 N
So, the average force exerted by the person on the box is 20 N. Hence, this is the required solution.
Answer:
Equivalent Resistance of Resistors in Parallel is
1/R = 1/r1 + 1/r2 .....
1/R = 1/7 + 1/7 + 1/7
R= 7/3
R=2.33ohms