Physics Help needed

[1784]

A child swinging on a swing passes the lowest position at the speed v= 3.2 m/s. The mass of the child is m= 35 kg. and the length of the swing is 3.5 m. The force with which the seat of the swing acts on the child is (in N)
a) 623 b) 308 c) 445 d) 565 e) 810

 

[苦逼热狗]

Fnet = m * a

S = So + aT
m = 35
D = Save * T
D = 3.5

do the math!