[0/10 Points]\ SCALCET9 2.7.012.MI. 2/9 Submissions Used\ If a rock is thrown upward on the planet Mars with a velocity of

15(m)/(s)

, its height above the ground (in meters) after

t

seconds is given by

H=15t-1.86t^(2)

.\ (a) Find the velocity (in

(m)/(s)

) of the rock after 1 second.\

(m)/(s)

\ Enter a numbers\ (b) Find the velocity (in

(m)/(s)

) of the rock when

t=a

.\

(m)/(s)

\ (c) When (in seconds) will the rock hit the surface? (Round your answer to one decimal place.)\

t=,\\\\times s

\ (d) With what velocity (in

(m)/(s)

) will the rock hit the surface?\

(m)/(s)

\ Need Help?\ Show My Work (Optional)

If a rock is thrown upward on the planet Mars with a velocity of 15m/s, its height above the ground (in meters) after t seconds is given by H=15t1.86t2. (a) Find the velocity (in m/s ) of the rock after 1 second, m/s (b) Find the velocity (in m/s ) of the rock when t=a. m/s (c) When (in seconds) will the rock hit the surface? (Round your answer to one decimal place.) t= s (d) With what velocity (in m/s ) will the rock hit the surface? m/s