Aboy throws a rock straight up into the air. it reaches the highest point of its flight after 2.5 seconds. how fast was the rock going when it left the boy's hand?

Explanation:

As we know that when rock moves upwards against gravity the velocity of rock will decrease with time and when it will reach the highest point it's velocity becomes zero

So we can use kinematics equation here such that

now we will have

co2reflects heat radiation back to earth buning coal and oil emits co2 globe warms

grav force prop 1/r squared 2r all squared is 4rsquared 1/4rsquared quartered