1. A 402-kg roller coaster is moving with a speed of 16.7m/s at the top of a 16.2 meter-high loop. What is the kinetic energy of the loop?

2. A barrel rider is moving in a circle with a speed of 6.0 m/s. The acceleration of the rider is 8.1 m/s. The speed of the object is somehow increased to 12.0 m/s. Find the new acceleration assuming that the radius of the circle had not changed

3. Tyrone and Mia have masses of 84.8 kg and 57.2 kg respectively. they sit 1.16 meters apart in the front center of Mr.H's physics class. For some time, they each have been sending a sort of electricity in their growing relationship. And now, they have learned that they are also gravtionally attracted to each other. Determine the magnitude of thsi force of gravitational attractive in scientific notation