Question

You started to run at 10 km/h when you left your house and you arrived at school 30 minutes later. Assuming that your average acceleration was 30 km/h^2, how fast were you running when you arrived?

Answer 1

Answer on Question #54868, Physics | Mechanics | Kinematics | Dynamics

Task: You started to run at 10 km/h when you left your house and you arrived at school 30 minutes later. Assuming that your average acceleration was 30 km/h^2, how fast were you running when you arrived?

Solution:

using the equation of motion

$$v = u + at$$

where

$$v$$

is the final speed,

$$u = 10 \, \text{km/h}$$

is starting speed,

$$a = 30 \, \text{km/h}^2$$

is acceleration and

$$t = 0.5$$

hours is time.

$$v = 10 + (30 \times 0.5) = 10 + 15 = 25 \, \text{km/h}$$

Answer: 25 km/h

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