tolong dibantu ya.....

2. t = 10 s
h???
vt = gt
10 × 10
100 m/s
h = vt
100 × 10
1000 m

3. h = 20 m
v dalam h = 10 m?
v = akar 2 gh
akar 2 × 10 × 10
akar 200
=15, berapa gt isinya