Question

An amusement park ride whisks you vertically upward. You travel at a constant speed of 15 m/s during the entire ascent. You drop your phone 4.0 s after you (and your phone) begin your ascent from ground level.

a. How high above the ground is your phone when you drop it?
b. Find the maximum height above the ground reached by your phone.

Answer 1

a. 60 m

b. 71.48 m

Step-by-step explanation:

Below are the calculations:

a. The phone's height above the ground = Speed x Time

The phone's height above the ground = 15 x 4 = 60 m

b. Speed when phone drops, u = 15 m/s

At maximum height, v = 0

Use below formula:

v² = u² -2gh

0 = 15² + 2 × 9.8 × h

h = 11.48 m

Total height = 60 + 11.48 = 71.48 m