A projectile moves with a position vector so that its horizontal component is x(t) = 140t and its vertical component is y(t) = -5t2. Which of the following is the vertical component of the...

Question

A projectile moves with a position vector so that its horizontal component is x(t) = 140t and its vertical component is y(t) = -5t². Which of the following is the vertical component of the acceleration vector at any time t? (2 points)

A	-10
B	0
C	-10t
D	140

Answer 1

Vertical component of velocity v_y = y'(t) = - 10t;

Then vertical component of acceleration a_y = - 10.

Answer is A