Aroller coaster accelerates at a rate of - 3 m/s ^ 2 from 25 m/s at the bottom of a hill to 10 m/s s at the top how long does it take the coaster to reach the top of the hill ?

5 seconds

Explanation:

Acceleration,

Where v and u are the final and initial velocities of the roller coaster respectively, t is the time taken for the coaster to reach the top of the hill.

Making t the subject then

Substituting -3 m/s2 for a since it decelerates, 25 m/s for u, then 10 m/s for v then

sonar - device which is used to find the submit submarines, sankalp ship. sonar waves consists of a transmitter and detector which are installed in the observation centre on board of a ship. the ultrasonic waves are sent into the sea at high frequency about 1000 khz in all direction.