You are running at a speed of 10 km/h and hit a patch of mud. two seconds later speed is 8 km/h. what is your acceleration in units of m/s^2

That depends on what kind of environ meant it is in  in space it has the same force that was applied when the velocity was gained

When seismic waves hit a fault, the waves are reflected off the fault. seismograph can detect these reflected seismic waves. geologists then use these data to map the fault's length and depth

The answer is periosteum