1/2×0.30×9.8^2=1/2×0.30×v^2+0.30×9.8×(-19.6)
1/2×9.8^2=1/2×v^2+9.8×(-19.6)
1/2×96.04=1/2×v^2-192.08
48.02=1/2×v^2-192.08
1/2×v^2=48.02+192.08
=240.1
v^2=480.2
v≒21.91
≒21.8(m/s)
回答
疑問は解決しましたか?
1/2×0.30×9.8^2=1/2×0.30×v^2+0.30×9.8×(-19.6)
1/2×9.8^2=1/2×v^2+9.8×(-19.6)
1/2×96.04=1/2×v^2-192.08
48.02=1/2×v^2-192.08
1/2×v^2=48.02+192.08
=240.1
v^2=480.2
v≒21.91
≒21.8(m/s)