Please answer number 4 only, number 3 is just for reference and type the solution if you can thank you

is the potential energy of the mass at this position (c)? 3. A simple pendulum on earth released at an angle of 48" with the vertical completes a cycle in 4.3 s. Calculate the (a) length of the string: (b) frequency; (c) maximum velocity, and; (d) velocity at an angle of 10" with the vertical. 4. If the same pendulum in number 3 completes a cycle in 2.0 s in an unknown planet, calculate the (a) acceleration due to gravity on the planet; (b) frequency of the pendulum on the planet; (c) maximum velocity of the pendulum on the planet