Question

1. A car starts from rest and accelerates uniformly at 3.0 m/s2. A second car starts from rest 6.0 s later at the
same point and accelerates uniformly at 5.0 m/s2. How long does it take the second car to overtake the first car?

2. A ball is thrown downward from the top of a building with an initial speed of 25m/s. It strikes the ground after 2.0s. How high is the building?

Can someone help with this problems? please!
2. S=ut + [gt2]/2 u =25m/s t=2s g=10m/s2 S=25*2 +[10*4]/2 S=50+20 S=70m
t=4.65s

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