Question

river accelerates a 200 kg motorcycle which results in a force being exerted that  speeds up the motorcycle from 15m/s to 45m/s over a time interval of 13s.

Answer 1

The force acting on the motorcycle

$F=ma=m\frac{v-v_0}{t}=200\cdot\frac{45-15}{13}\approx462\ (N)$ . Answer