Can someone please help me answer this question i am really struggling can you show working so i can follow along

Q1a)

A demolition machine, that has a 740 kg wrecking ball attached to a wire, is brought in to knock a concrete wall down in an underground parking structure. Due to the enclosed space, the ball is only able to be raised to a height, X, of 2.1 m above the point of impact on the wall (which is also its lowest point, Y) as shown in the figure below. To make sure this height will still be able to get the job done, the engineers need to know what speed the ball will hit the wall at. X Y What speed will the wrecking ball be moving at when it impacts its target at point Y? Give your answer to 2 significant figures. Tips: Use g = 9.8 m/s'; check that your units are in base SI units before using them in your calculations; round only at the last steps; and only input a numerical value into the question's Quiz submission box (do not include units, as they are provided for you). m/sA physicist is packing their reference books into boxes to move to a new laboratory. As they are carrying one of the boxes of books, that has a mass of 4.0 kg, they accidentally drop the box on their foot from a height of 1.6 m. After the box comes to rest on the floor and the physicist stops yelling, they consider how much damage was just caused. To do this, they need to determine the impulse that has just occurred. The physicist, however, knows Newton's third law where every action has an equal and opposite reaction, and they don't want to know how much impulse was exerted on their foot from the box, but rather how much their foot fought back and exerted an impulse on the box! What is the magnitude of the impulse that was exerted on the box of books from the physicist's foot? Give your answer to 2 significant figures. Tips: Use g = 9.8 m/s ; check that your units are in base SI units before using them in your calculations; round only at the last steps; and only input a numerical value into the question's Quiz submission box (do not include units, as they are provided for you). kg.m/sAn area of forensic science that investigates the damage caused by bullets is called wound ballistics. When undertaking wound ballistics, the velocity of the bullet is crucial, both before and after impact, in determining the penetration depth. A scientist is testing for the penetration depths of a range of bullet calibers to determine the damage caused by each. To do this, they set up a test environment that includes a 4.60 kg block of ballistic jelly on a flat metal plate that rests on a smooth horizontal table. The first test consists of a bullet with a mass of 9.60 g and after firing the weapon, the speed radar clocks the bullet as traveling horizontally at 530 m/s just prior to hitting the block of ballistic jelly. The bullet buries itself in the block without passing through, which is what was hoped for in this test. So that the scientist can calculate the theoretical penetration depth (to compare with the real penetration depth), calculate the theoretical speed of the ballistic jelly block after the collision with the bullet. Give your answer to 3 significant figures. Tips: Use g = 9.8 m/s ; check that your units are in base SI units before using them in your calculations; round only at the last steps; and only input a numerical value into the question's Quiz submission box (do not include units, as they are provided for you)