Question

Answer 1

Bài 2.

\(P=10m=5N\Rightarrow m=0,5kg\)

\(v_0=23\)km/h\(=\dfrac{115}{10}\)m/s

\(W_đ=\dfrac{1}{2}mv^2_{bđ}=\dfrac{1}{2}\cdot0,5\cdot\left(\dfrac{115}{10}\right)^2=10,2J\)

Bài 3.

\(P=10m=5N\Rightarrow m=0,5kg\)

\(W_đ=\dfrac{1}{2}mv^2=\dfrac{1}{2}\cdot0,5\cdot7,2^2=12,96J\)

Answer 2

Bài 1.

\(P=10m=650N\Rightarrow m=65kg\)

\(v=\dfrac{S}{t}=\dfrac{600}{50}=12\)m/s

\(W_đ=\dfrac{1}{2}mv^2=\dfrac{1}{2}\cdot65\cdot12^2=4680J\)