The curved line PQR is the velocity-time graph for a car starting from rest. velocity
What is the average acceleration of the car over the first 5s?
The area below the curve PQ
The area of the triangle PQS
The gradient of the straight line PQ
The gradient of the tangent at Q​

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?