How many calories are equal to one btu? (one calorie = 4.186 j, one btu = 1 054 j.)

a. 0.252

b. 3.97

c. 252

d. 397

Will give brainliest! jay rides his 2.0-kg skateboard. he is moving at speed 5.8 m/s when he pushes off the board and continues to move forward in the air at 5.4 m/s. the board now goes forward at 13 m/s.a. determine jay’s mass.b. determine the change in the internal energy of the system during this process.(express your answer to two significant figures and include the appropriate units.)