added legend to numpy scritp

experiment/newton/newton.py

 import numpy as np
+import matplotlib.pyplot as plt
 
 time_pos = np.genfromtxt("input.txt", delimiter=",")
 
@@ -16,3 +17,8 @@ vel_p1 = np.roll(vel, -1)
 acc = (vel_p1 - vel) / (time_p1 - time)
 # print(np.mean(acc[0:len(acc)-2]))
 
+plt.plot(time[0:len(pos)], pos, label='position')
+plt.plot(time[0:len(vel)-1], vel[0:len(vel)-1], label='velocity')
+plt.plot(time[0:len(acc)-2], acc[0:len(acc)-2], label='acceleration')
+plt.legend()
+plt.show()