Respuesta :
Answer:
a) t = 4.14 s
b) Speed with which it hits the ground = 40.58 m/s
Explanation:
Using the equations of motion,
g = 9.8 m/s², y = H = 84 m,
Initial velocity, u = 0 m/s,
final velocity, v = ?
Total Time of fall, t = ?
a) y = ut + gt²/2
84 = 0 + 9.8t²/2
4.9t² = 84
t² = 84/4.9
t = 4.14 s
b) v = u + gt
v = 0 + (9.8 × 4.14)
v = 40.58 m/s
Answer:
A. t = 4.14 s.
B. 40.62 m/s.
Explanation:
Using the equations of motion,
Given:
g = 9.8 m/s²
S = 84 m,
S = vo*t + (a*t²)/2
vo = initial velocity
= 0 m/s
vi = final velocity
t = Time of motion
84 = 0 + (9.8*t²)/2
t² = 84/4.9
= sqrt(17.143)
t = 4.14 s.
B.
vi = vo + a*t
= 0 + (9.81 * 4.14)
= 40.62 m/s.
