Speed feat[]
OK, Saiki (in another body) makes a bit use of his superhuman capabilities here, by hitting a ball he originally missed.
Lets see what we get. First teh speed of the ball. Even though it curves it is noted on the panel that the ball has the speed of a fast ball. So I will go with that.
According to this the speed of a highschool fast ball should be at least 75 mph = 33.528 m/s
Next the diameter of a baseball is according to wikipedia 0.07468 m
How far did the ball move in the 3 panels? Well, the image moves during the panels, but due to the after images we have a fix point. The point at which the ball begins going down should always stay the same position. So we simply count the afterimages to get the distance. In the beginning there are 4 afterimages from the fixpoint onward, in the end 6. So the ball moved 2 times its diameter = 0.14936 m
So our timeframe is: 0.14936/33.528 = 0.0044547840610833 seconds. That is the timefrae for the feat.
Now we have to figure out the distance:
Baseball diameter = 17 px = red line = 0.07468 m
Arm length = 82.9 px +60 px = 142.9 px = 0.62775129411764874 m = blue lines
Now he rotated the arms full 180° it seems (shoulder first in the front is now behind him), so
0.62775129411764874 * π = 1.97213885388149086793 m
Now we see from his afterimage that he moved some distance with his whole body as well. So lets add that on top:
yellow line = 17 px = 0.07468 m
green line = 56 px = 0.2460047058823536 m
0.2460047058823536 m + 1.97213885388149086793 m = 2.21814355976384446793 m (hmm should I add those two together? well..)
2.21814355976384446793 m/ 0.0044547840610833 sec = 497.92392388699610305762321 m/s = Mach 1.449138312
Supersonic. Nice.
Explosion feat[]
You will have to zoom in on this picture to see stuff...
So here is a large explosion he caused.
I will go by the rounding of the earth here.
Radius of earth = red line = 1834 px = 6371000 m
explosion = green line = 95 px = 330013.631406761177754 m
= 330.013 km
Nuke calculator gives 2029000 megatons = 2.029e12 tons tnt
2.029e12 * 0.4 = 8.116e11 tons of tnt
Large Island level