Question

9)

Answer 1

http://prntscr.com/4bocvq

Answer 2

Since the total resistance is 25 N, the cyclist must apply an equal force to overcome this force and gain a constant velocity of 12m/s
P=F.V
=> P= 25\(\times\)12=300W

Answer 3

I can do the rest

Answer 4

Now, the resistance is reduced to 15N and the output power is same.
=> 300=15\(\times\)V
=> V=300/15=20m/s

Answer 5

Thanks @Abhisar

Answer 6

\(\rlap{\color{blue}{\huge\bigstar}\huge \color{blue}{ \text{You're Most Welcome! }}\color{blue}\bigstar}{\; \color{aqua}{\huge\bigstar}\huge \color{aqua}{\text{You're Most Welcome! }}\color{aqua}\bigstar}\)
\(~~~~~~~~~~~~~~~~~~~~~~~~~~~\color{green}{\huge\ddot\smile}\color{blue}{\huge\ddot\smile}\color{pink}{\huge\ddot\smile}\color{red}{\huge\ddot\smile}\color{yellow}{\huge\ddot\smile}\)