b
અહી , \( v = { {u}} + { {at}}\) પરથી \(, {{ {v}}_{ {1}}} = a{t_1}\)

અથવા \(a = \frac{{{v_1}}}{{{t_1}}}\)

તેમજ \(v = at = \frac{{{v_1}}}{{{t_1}}} \times t\)

પાવર \( = \left| {\left. {\overrightarrow F \cdot \overrightarrow v } \right| = mav = m \left[ {\frac{{{v_1}}}{{{t_1}}} \times t} \right]} \right. \left[ {\frac{{{v_1}}}{{{t_1}}}} \right] = \frac{{mv_1^2 t}}{{t_1^2}}\)