Question

A rock is thrown upward, on Mars, with an initial velocity 19m/s. It's height "t" is h(t) = 19t-1.9t^2. What is the acceleration at time "t"?

Answer 1

take second derivative of h(t) to get acceleration

Answer 2

Thank you. How do I calculate how fast the rock is going when it hits the ground?

Answer 3

to me, the first derivative is velocity .

Answer 4

and find t by let the original function =0, because of this logic: After get the highest point, the rock fall back and hit the ground, at that moment h = h initial =0