Answer:
4. The lizard's average acceleration is 2 m/s²
3. The final velocity will be 160 m/s
Explanation:
Average acceleration is the final velocity minus the initial velocity per
time taken
4.
A lizard accelerates from 2 m/s to 10 m/s in 4 seconds
The initial velocity is 2 m/s
The final velocity is 10 m/s
The time is 4 seconds
We need to find the average acceleration
→ Average acceleration = [tex]\frac{v-u}{t}[/tex], where v is the final velocity,
u is the initial velocity and t is the time
→ u = 2 m/s , v = 10 m/s , t = 4 s
Substitute these values in the rule above
→ Average acceleration = [tex]\frac{10-2}{4}=\frac{8}{4}=2[/tex] m/s²
The lizard's average acceleration is 2 m/s²
3.
If a Ferrari, with an initial velocity of 10 m/s, accelerates at a rate of 50 m/s²
for 3 seconds
Initial velocity is 10 m/s
Acceleration is 50 m/s²
Time is 3 seconds
We need to find the final velocity
Use the rule of acceleration above to find the final velocity
→ Acceleration = [tex]\frac{v-u}{t}[/tex]
→ u = 10 m/s , a = 50 m/s² , t = 3 s
Substitute these values in the rule
→ [tex]50=\frac{v-10}{3}[/tex]
Multiply both sides by 3
→ 150 = v - 10
Add 10 to both sides
→ v = 160 m/s
The final velocity will be 160 m/s
