Please help with these Calculus quotations. Please type the answer don't write it in paper.

9. A construction worker accidently drops a hammer from a height of 90 m while working on the roof of a new apartment building. The height, s, in metres, of the hammer after t seconds can be modelled by the function s (t ) =90-4.9t2, t> 0. a. Determine the velocity at 1 s and 4 s. (1 mark) b. When will the hammer hit the ground? (1 mark) c. Determine the impact velocity of the hammer. (1 mark) 10. The motion of a particle is described by the position function s(t) =2t3-15t2+33t+17, t> 0 , where t is measured in seconds and s(t) in metres. a. When is the particle at rest? (2 marks) b. When is the velocity positive? (2 marks) c) Draw a diagram to illustrate the motion of the particle in the first 10 seconds. (1 mark) d) Find the total distance traveled in the first 10 seconds. (1 mark) 11. A snowball melts so that its surface area decreases at a rate of 0.5 cm2/min. Find the rate at which the radius decreases when the radius is 4 cm. (SA=4xr?) (4 marks)12. Brent is driving west at 60 kmlh and Aaron is driving south at 70 km/h. Both cars are approaching the intersection of the two roads. At what rate is the distance between the cars decreasing when Brent's car is 0.4 km and Aaron's is 0.3 km from the intersection? (4 marks) 13. Awater tank at a ltration plant is built in the shape of an inverted cone with height 5.2 m and diameter 5 m at the top. Water is being pumped into the tank at a rate of 1.2 m3lmin. Find the rate at which the water level is rising when there is 811 m3 of water. (4 marks) 14- For the function f X)=HX3+bX2-5X+9 , determine the values of a and b so that f(-1)=12 and f'(1)=3. (4 marks) 15. Determine the equations of two lines that pass through the point (-1,-3) and are tangent to the graph of y=x2+1. (8 marks) 16. Two particles have positions at time t given by S, =4l' -f2 and S; =5t2 '13. Find the velocities v1 and v2 at the instant the accelerations of the two particles are equal.