Physics question urgently

1. A car accelerates uniformly from rest and travels a distance of 60m in 6s. Calculate the acceleration of the car.

Using a=2s/t^2 I get 3.3ms^2

2. A trolley accelerates down a slope. Two photo cells spaced 0.5m apart measure the velocities to be 20cms-1 and 50cms-1. Calculate the time taken to cover the 0.5m. I’ve worked the acceleration out to be 21cms^2.