Question

what is the mass of an object that weighs 250 n on the surface of the earth where the acceleration due to gravity is 9.80 m/s2?
250 kg
24.5 kg
25.5 kg
2,450 kg
question 8 (1 point)
if the vector sum of external forces is zero, a moving object will
move with constant velocity.
stop immediately.
go faster and faster.
slow down and eventually come to a stop.
question 9 (1 point)
if you exert a force f on an object, the force which the object exerts on you will

Explanation:

First Question (Mass Calculation)

Step1: Recall the formula for weight

The weight \( W \) of an object is given by the formula \( W = m \cdot g \), where \( m \) is the mass and \( g \) is the acceleration due to gravity. We need to solve for \( m \), so we rearrange the formula to \( m=\frac{W}{g} \).

Step2: Substitute the given values

We are given \( W = 250 \, \text{N} \) and \( g = 9.80 \, \text{m/s}^2 \). Substituting these values into the formula, we get \( m=\frac{250}{9.80} \approx 25.5 \, \text{kg} \).

According to Newton's first law of motion, if the net (vector sum) of external forces acting on an object is zero, the object will maintain its state of motion. If it is moving, it will continue to move with a constant velocity (constant speed in a straight line). The other options are incorrect: "stop immediately" and "slow down and eventually come to a stop" imply a force acting to stop it, and "go faster and faster" implies a net force causing acceleration.

Answer:

25.5 kg

Second Question (Newton's First Law)