If an object is in free fall for four seconds, about how fast will it be falling?
a) 10 m/s
b) 20 m/s
c) 30 m/s
d) 40 m/s

In the derivation of rrkm theory, a factor of 1/2 is introduced when equalizing the rates of formation and decomposition of activated complex as keal-hr) = ko this is clearly against the assumption of transition state theory that states all the activated complex in the transition state iss going to the product. find the reason why this factor is introduced here.

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?