At the highest point of the object's trajectory, the velocity becomes zero as it momentarily comes to a stop before changing direction and falling back down. At this point, the only force acting on the object is the force of gravity.
The force of gravity acting on an object can be calculated using the formula:
F = m * g
where F is the force of gravity, m is the mass of the object, and g is the acceleration due to gravity.
In this case, the mass of the object is given as 10 kg. The acceleration due to gravity on the Earth's surface is approximately 9.8 m/s².
Substituting the values into the formula, we get:
F = 10 kg * 9.8 m/s²
Calculating this, we find:
F = 98 N
Therefore, the force of gravity acting on the object at the highest point is 98 Newtons (N).