Am nevoie urgenta de la proboleme, de la 8 la 11,macar cateva probleme daca nu le stiti pe toate, va rog din inima nu stiu sa fac si am nevoie de ajutor.

Given the position vector of the particle r(t)=(t+1)i+(t^2−1)j+2t k, find the particle's velocity and acceleration vectors at t=1

Need asap ‼️ 20 pts which gravitational force field diagram is drawn correctly? (answers in pictures below)

Agroup of students were investigating the force of gravity. they began by dropping a foam ball from a height of 3 meters into a bucket of sand. the ball hit the sand in 0.306 seconds. they dropped additional balls of approximately the same diameter, but of different masses. here is the data they collected. based on this experiment and the collected data, what would their conclusion be?