Question

A freely falling object is found to be moving downward at 18 m/s. If it continues to fall, two seconds later the
object would be moving with a speed of
(A) 8.0 m/s (B) 10 m/s (C) 18 m/s (D) 38 m/s (E) 180 m/s

Answer 1

Answer:

well this question uses equation of motion

Explanation:

u is 18

v we need to find

a is - 10

v = u + at

18+10*2

38

Answer 2

Given - Initial velocity (u) = 18m/s, time (t) = 2s

To Find - Final velocity (v) = ?

Solution -

The given problem can be solved using the following method/process that is as follow:

According to the third law of motion given by newton.

v = u + gt .........(Formula)

As per the given condition,

Initial velocity (u) = 18m/s

time (t) = 2s and g = 9.8$m/s^{2}$ ... (as the body is falling towards the earth's surface)

∴ By putting the given values in the above-mentioned formula. we get,

v = 18 + (9.8)(2)

v = 18 + 19.6

∴ v = 37.6m/s

Hence, the object would be moving with a speed of 37.6m/s