Question

A plane stops from 250 mph in 25 seconds. Calculate the plane's acceleration.

Answer 1

Explanation:

Given:

v₀ = 250 mph

v = 0 mph

t = 25 s

Find: a

v = at + v₀

(0 mph) = a (25 s) + (250 mph)

a = -10 mph/s

Answer 2

The acceleration of the plane is $- 10 mph$

• Acceleration can be regarded as rate at which velocity changes with respect to time.

• final speed=$V(0)= 0mph$

• The initial speed $(Vf)$  is given as$250 mph$

• acceleration (a) = ??

• time taken $= 25 s$

• from law of motion   $V= at +V(0)$

Then substitute, we have

• $0= 25a + 250$

• $-25a= 250$

• $a= - \frac{250}{25}$

$= - 10 mph/s$

Therefore, the acceleration is -10mph/s

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