c. Slok and his father are sitting at the distance of 5m on a seasaw. His father is at the distance of 2m from the fulcrum and Slok weighs 20 kg. If they are balancing the seasaw, find the weight of his father.​

Abatter hits a 0.140-kg baseball that was approaching him at 30 m/s and, as a result, the ball leaves the bat at 40 m/s in the reverse of its original direction. the ball remains in contact with the bat for 2.0 ms. what is the magnitude of the average force exerted by the bat on the ball?