Đáp án:
\(\begin{array}{l}
a.W = 11,25J\\
b.h = 5,625m\\
c.\\
{W_t}' = 10J\\
W' = 11,25J\\
{W_d}' = 1,25J
\end{array}\)
Giải thích các bước giải:
\(\begin{array}{l}
a.\\
W = \frac{1}{2}m{v^2} + mgh = \frac{1}{2}.0,{1.15^2} + 0 = 11,25J\\
b.\\
{W_t} = {W_d} = \frac{W}{2}\\
mgh = \frac{{11,25}}{2}\\
0,1.10h = \frac{{11,25}}{2}\\
\Rightarrow h = 5,625m\\
c.\\
s = {v_0}t + \frac{1}{2}g{t^2} = 15.2 + \frac{1}{2}.( - 10){.2^2} = 10m\\
{W_t}' = mgh = 0,1.10.10 = 10J\\
W' = W = 11,25J\\
{W_d}' = W' - {W_t}' = 11,25 - 10 = 1,25J
\end{array}\)