Question 31 (1 point) A water fall is 70 m high. What is the increase in temperature(in degrees C) of the water at the bottom of the falls if all of the initial potential energy goes into heating of the water? (specific heat of water is 4186 J kg C ) O.16 O.34 . 69 1.4 2.3Question 40 (1 point) A ball on the end of a tight string of length. 2 m is released from a height of 90 cm. What is the velocity at the bottom of the swing 4.2 m/s 42 m/s O.31 ms .66 m/s 6.6 m/s