...a)vt-0.5*10t^2=20 and v-10t=0=>v=10t 故10t^2-5t^2=20 t=2=>v=20m/s upward <---initial velocity (b)t=2(s) (c)20m/s (d)at 0.5(sec)=>h=20*0...
...of the circular path. Therefore, the acceleration is pointing upward . So, the ans. is A. 3. By Newton...
... standing atop a spring in an elevator as it accelerates upward at 3.0 m/s^. The spring constant is 2500 N/m. By how...
大衛引用目前描述高空向上閃電( upward discharge)現象較為完整的準靜電場模型( quasi-electrostatic model)簡稱QE模型供...
... (about 2.5 cm). If you like, you can make the hole faced upward bigger to increase the air flow (for better convection). I ...
...50，加速度a=2，加速期間行走150m） period1:發射到熄火間：加速度＝2 m/s^2 upward 【用V'^2－V0^2＝2ad】 V'^2－50^2＝2*2*150...
...波延肌束前進，而原先細胞膜帶正電，就逐漸變成負電，肌電圖將呈向上的波形( upward deflection)。緊接著恢復到靜止狀態，準備接受下一次的刺激。 2008-05-20 18:37...
...: (Vsin 12°)T - 4.9T² = -1.5 (Taking upward as positive direction) Horizontally: (Vcos 12°)T = 84.1...
...可能是正的, 零,或是負的 Fred throws a ball 30 m/s vertically upward . How long does it take to hit the ground 2 meters below...
