Aparticle moves on a coordinate line with acceleration startfraction d squared s over dt squared endfraction equals 45 startroot t endroot minus startfraction 21 over startroot t endroot endfraction d2s dt2=45t− 21 t, subject to the conditions that startfraction ds over dt endfraction equals 6 ds dt=6 and sequals=1818 when t equals 1t=1. find the velocity v equals startfraction ds over dt endfractionv= ds dt in terms of t and the position s in terms of t.

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

hope this !

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when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min