Thread: One Dimensional Kinematics Question

Hello all, first post so I'll try to be as clear as possible. I'm doing some revision for a University exam, and I have been trying to learn about trigonometry and some complementry equations for Vector explaination in 2D.

I've managed to figure out the trig suff so I have the tools but not the knowledge to figure the rest out. Here is my question:

A Dinosaur is running scared as Meteors fall onto the Earths surface, at a given point his life becomes in peril as one Meteor looms over head and may well be set to directly collide with our fearful lizard friend.

- The Dinosaur is travelling at a constant velocity of "X"km/h.
- The Meteor is travelling at an initial velocity of 100km/h and is accelerating at 2km/h².
- As it happens we know where the meteor hits and sadly the Dinosaur is struck after having travelled 200km. (yes I know the distance is rather unbelievable)
- The Meteor started directly above our x-dino friend stationed 200km above it, before hitting the dinosaur, trigonometry says that the meteor had travelled 282.885km.

Here are the questions;
- how long did it take the meteor to travel 282.885km?
- and using that time how fast was the dinosaur going to have been so unlucky?

The difficulty comes from the meteor not just having a velocity but also acceleration.

standard kinematics equation with constant acceleration ...



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use the quadratic formula to solve for t in hours ... calculate the dino's speed using your calculated time and the distance it traveled.

Why thank you very much, that was very clear.