Question

1) What is the instantaneous velocity of a freely falling object 14 s after it is released from a position of rest?

2) What is its average velocity during this interval?

3) How far will it fall during this time?

Answer 1

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What is the instantaneous velocity of a freely falling object 10s after it is released from a position of rest? What is its average velocity during this 10s interval? How far will it go during this velocity during this time?

Initial velocity  u = 0 m / s
Accleration a = g = 9.8 m / s 2

time t = 10 s

Let   instantaneous velocity of a freelyfalling object 10s after it is released from a position of restbe v then , from the relation ,

v = u + at we have   

v = gt

     = 98 m / s

Let the distance travelled in 10 s be S thenfrom the relation ,

S = ut + ( 1/ 2) a t ²    weget

S = ( 1/ 2) g t ²

    = 490 m

?    its average velocity duringthis 10s interval v ' = S / t

                                                                                    = 49 m / s