Question

Isabella drops a pen off her balcony by accident while celebrating the successful completion of a physics problem. Assuming air resistance is negligible, how many seconds does it take the pen to reach a speed of 19.62 m/s?

Answer 1

Dear Student,

● Answer -

t = 2 s

◆ Explaination -

# Given -

v = 19.62 m/s

# Solution -

As the pen falls off, its motion starts from rest.

u = 0 m/s

According to Newton's 1st law of kinematics -

v = u + at

Substitute, u = 0 m/s and a = 9.8 m/s^2.

19.62 = 0 + 9.8 × t

t = 19.62 / 9.8

t = 2 s

Therefore, the pen will take 2 s to reach a speed of 19.62 m/s.

Best luck dear...