To determine the acceleration and force acting on a body as it increases its velocity, we need to convert the given velocities from km/h to m/s, as the SI unit for velocity is meters per second.
Given: Mass of the body, m = 9 kg Initial velocity, u = 18 km/h Final velocity, v = 72 km/h
Converting the velocities to m/s:
Initial velocity, u = 18 km/h = (18 * 1000 m) / (60 * 60 s) ≈ 5 m/s Final velocity, v = 72 km/h = (72 * 1000 m) / (60 * 60 s) ≈ 20 m/s
To calculate the acceleration, we can use the equation:
a = (v - u) / t
where: a is the acceleration, v is the final velocity, u is the initial velocity, and t is the time taken.
However, the time taken is not provided in the given information. Without the time, we cannot directly determine the acceleration or force acting on the body. If you can provide the time taken or any additional information, I will be able to assist you further in calculating the acceleration and force.