Answer:
10 m
Explanation:
Weight = 10 N
mg = 10
m = 10 / 10 = 1 kg
g = 10 m/s^2
Initial mechanical energy = 40 J
Final mechanical energy = 140 J
change in total energy = 140 J – 40 J = 100 J
At the maximum vertical height, the velocity = 0 m/s
So,it has only potential energy at maximum height
P = m x g x h
100 = 1 x 10 x h
h = 10 m
Did you mean to put a picture with the question
a. Average speed = distance / total time
distance = 38 meters (going away) + 38 meters (going back)
= 76 meters
total time = 9 seconds (going away) + 1.8 seconds (going
back) = 10.8 seconds
Average speed = 76 meters / 10.8 seconds = 7.04 m/s
b. Average
velocity = displacement / total time <span>
Displacement = Final position – Initial position
Initial position = 0 m
<span>Final position = 0 m (since it gallops back to the trainer)
Displacement = 0 m – 0 m = 0
total time = 10.8 seconds
<span>Average velocity = 0 / 10.8 = 0 m/s</span></span></span>