hello can someone help me, thank you!

if a pendulum having a period of 1.50s on earth is taken to an extra-solar planet where its period is 0.750s, what is the acceleration due to gravity on this planet?

a 9.30kg cart is connected to a spring with a rest length of 51cm the cart is then pulled to the side, stretching the spring by 6.50cm and released, if the maximum speed attained by the cart in the resulting simple harmonic motion is 2.90m/s the spring constant of the spring is?