questions: if a rock is thrown upward on the planet mars within velocity of 10m/s, its height in meter t second later is given by y=10t-1.86t^2.

1.) find the average velocity over the time interval

a) [1,2]

b) [1,1.5]

c) [1,1.1]

d) [1,1.01]

e) [1, 1.001]

2.) find the instantaneous velocity when t=1