Question

1. a 40 n force acts on a 10 kg box. what is its acceleration? a) 2 m/s² b) 4 m/s² c) 10 m/s² d) 400 m/s² 6. which best represents newtons third law? a) a runner speeds up when pushing harder against the ground. b) a soccer ball stays still until its kicked. c) a toy car keeps moving until it hits a wall. d) a ball falls because of earths gravity. 7. which formula is correct for speed? a) force ÷ mass b) distance ÷ time c) mass × acceleration d) velocity ÷ time 8. which of the following is an example of velocity? a) 10 m/s b) 50 km/h north c) 15 seconds d) 100 kilograms part b - short response 7. explain the difference between distance - time graphs and velocity - time graphs. what does the slope represent in each? 8. a passenger feels pushed backward when a car suddenly accelerates. which of newtons laws explains this, and why?

Explanation:

5.

Step1: Recall Newton's second - law formula

$F = ma$, where $F$ is force, $m$ is mass, and $a$ is acceleration. We need to solve for $a$, so $a=\frac{F}{m}$.

Step2: Substitute given values

Given $F = 40N$ and $m = 10kg$. Then $a=\frac{40N}{10kg}=4m/s^{2}$.

Newton's Third Law states that for every action, there is an equal and opposite reaction. A runner speeding up when pushing harder against the ground shows the ground pushing back on the runner (action - reaction pair).

Speed is defined as the distance traveled per unit of time. The formula for speed is $v=\frac{d}{t}$, where $v$ is speed, $d$ is distance, and $t$ is time.

Answer:

b) $4m/s^{2}$

6.