What tectonic feature lies along chinas chinas eastern border

transform fault

Explanation: Transform faults are major tectonic features affecting the lithosphere and constitute strike- slip plate boundaries 

The border of thickness change of Eastern China lithosphere is located west to recent gravity. It lies along the tectonic boundary between the Huaiyu-Tianmu mountains passive . is principally a part of the Eurasian plate, but the margins of the Indian and Philippine Sea plates are involved in the Himalayas and in the Coastal Range of Taiwan, respectively.

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s