Question

an object starts from 30 m/s velocity and reaches 126 km/h in a 1 km distance. assuming a constant acceleration, what was the elapsed time?

Answer 1

The elapsed time of the object is determined as 30.77 s.

How to calculate the elapsed time of the object?

The elapsed time of the object is calculated by applying the following kinematic equation as shown below;

s = t x (v + u)/2

where;

• v is the final velocity of the object
• u is the initial velocity of the object
• t is the time of motion

The given parameters include;

final velocity, v = 126 km/h = 35 m/s

initial velocity, u = 30 m/s

distance traveled = 1 km = 1,000 m

The elapsed time of the object is calculated as;

t = (2s) / (v + u)

t = ( 2 x 1,000) / ( 30 + 35)

t = 30.77 s