4) A ball is shot from the ground into the air. At a height of 9.1m, its velocity is observed to be v =7.6 i + 6.1 j in meters per second. (a) To what maximum height does the ball rise? (b) What horizontal distance does the ball travel? What are (c) the magnitude and (d) the direction of the ball’s velocity just before it hits the ground? 5) When a large star becomes a supernova, its core may be compressed so tightly that it becomes a neutron star, with a radius of about 20 km (about the size of the San Francisco area). If a neutron star rotates once every second, (a) what is the speed of a particle on the star’s equator and (b) what is the magnitude of the particle’s centripetal acceleration? (c) If the neutron star rotates faster, do the answers to (a) and (b) increase, decrease, or remain the same? thanks!