For safety in climbing mountaineers use as nylon rope that is 50 m long and 0.01 m in diameter. When supporting a 900 N climber the rope stenches1.6 m under tension. Find elastic modulus for the nylon rope.

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

kepler used the data from tycho blahe (his mentor) to construct the laws of planetary motion.

where are the vectors ?