Question

4. A lizard accelerates from 2 m/s to 10 m/s in 4 seconds. What is the lizard's average acceleration?

Answer 1

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 = $\frac{v-u}{t}$, 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 = $\frac{10-2}{4}=\frac{8}{4}=2$ 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 = $\frac{v-u}{t}$

→ u = 10 m/s , a = 50 m/s² , t = 3 s

Substitute these values in the rule

→ $50=\frac{v-10}{3}$

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