\(v^2-v^2_0=2aS\Leftrightarrow6^2-4^2=2\cdot a\cdot40\Leftrightarrow20=80a\Rightarrow a=0,25\left(\dfrac{m}{s^2}\right)\)
\(s=v_0t+\dfrac{1}{2}at^2=4\cdot2\cdot60+\dfrac{1}{2}0,25\cdot\left(2\cdot60\right)^2=2280\left(m\right)\)
Gia tốc vật:
\(v^2-v^2_0=2aS\Rightarrow a=\dfrac{v^2-v^2_0}{2S}=\dfrac{6^2-4^2}{2\cdot40}=0,25\)m/s2
Quãng đường đi trong 2 phút:
\(S=v_0t+\dfrac{1}{2}at^2=4\cdot2\cdot60+\dfrac{1}{2}\cdot0,25\cdot\left(2\cdot60\right)^2=2280m\)