Bethany is walking her dog, Lara, in a park. Lara weighs 15 kg. As they enter the park, a squirrel grabs Lara's attention, causing her to suddenly start running to chase after it. Bethany, who weighs 60 kg, is surprised by the sudden force and tries to pull the leash with a force of 50 N in the opposite direction to stop Lara. Assume that the friction between Lara's paws and the ground can be ignored. What is the acceleration of Lara while she's running after the squirrel? How much energy does Lara possess when she starts running, and how much work does Bethany do to stop her?

To solve this problem, we can use Newton's second law, 1D kinematics, and energy conservation.

please draw a picture