mA = 200kg
mB = 300kg
µk = 0,25
PB = mB . a PB = 300 . 9,81 PB = 2943N
PA = mA . a PA = 200 . 9,81 PA = 1962N (força PA = força NA)
Fat = µk . NA Fat = 0,25 . 1962 Fat = 490,5N
B PB – T = mB . a
A + T – Fat = mA . a
PB – Fat = (mB + mA) . a
2943 – 490,5 = (300 + 200) . a
2452,5 = 500a
2452,5 = a
500
a = 4,9m/s²