If a stone is dropped from the edge of the roof how long does it take to fall 4.9m and what is its speed at the end of that fall?

If a stone is dropped from the edge of the roof how long does it take to fall 4.9m and what is its speed at the end of that fall?
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Answer :

There is an equation which states:S=V0t+1/2*at2S is the distanceV0 is the initial velocityt is time takena is accelerationIn your case,S=V0t+1/2*at24,9=0*t+1/2*9,8*t24,9/4,9=t21=t2t=1 secondYou can calculate the final velocity with simple equationa=V2-V1/t9,8=V2/1V2=9,8m/s2
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