Jawapan

2015-10-06T15:07:37+08:00
V=u+at // 20ms^-1= 0+(10ms^-2)t // t=20ms^-1/10ms^-2 // t=2s // ulang alik = 4s // pls correct me if im wrong :)
its correct
10 ms^-2?blh jlskn ..tq
a=g(pecutan graviti bumi)