A 15 kg block is accelerated at 2.0m/s2 along a horizontal frictionless surface, with the speed increasing

Question:

A 15 kg block is accelerated at 2.0m/s2 along a horizontal frictionless surface, with the speed increasing from 10 m/s to 30 m/s. What are?
(a) The change in the block's mechanical energy and
(b) The average rate at which energy is transferred to the block? What is the instantaneous rate of that transfer when the block's speed is?
(c) 10 m/s and
(d) 30 m/s