To determine the time it takes for the body to return to the point of projection, we need to consider the vertical motion and the effects of gravity. When an object is projected vertically upwards, its motion is governed by the laws of free fall.
In this case, the initial velocity (u) of the body is +60 m/s (positive because it is directed upwards), and the acceleration due to gravity (g) is approximately 9.8 m/s² (assuming no significant air resistance).
The formula to calculate the time (t) it takes for an object to reach its maximum height or return to the point of projection is given by:
t = u / g
Substituting the values:
t = 60 m/s / 9.8 m/s²
t ≈ 6.12 seconds
Therefore, after approximately 6.12 seconds, the body will return to the point of projection.