4 Baloo the Bear is back to his old tricks. This time he stole a shopping cart
and decided to race it down a hill. The acceleration of a shopping cart
rolling down the hill is 0.85m/s2. If he trips and push the cart forward with
an initial velocity of 2m/s, How fast is the cart going after 4 seconds? *

Alice and marge are studying the properties of matter. the girls placed some an iron nail in a beaker containing water. iron is a solid metal at room temperature. iron is a shiny and malleable; it can be formed into shapes like the nails the girls used. iron will turn reddish-brown in the presence of air or water as it rusts. iron is a good conductor of electricity and heat. after 48 hours, the girls checked the nail in the water and compared it to the nail they left on the lab bench. here is a photo of their results. based on the girls' experiment, what is a chemical property of iron? a) iron is malleable. b) iron rusts in water. c) iron is a strong metal. d) iron is a good conductor.

Plz, guys answer 20 and 21. it's urgent

Nancy is playing on a ladder and slide. the entry point of the slide is 3.0 meters above the ground and the slide is inclined at an angle of 30.0° with the horizontal. what is nancy's displacement each time she slides down from the top?