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Ask out loud about anything on your screen. chalk answers, marks the real thing, and shows you how it works. It’s on the way to your PC: join the list and we’ll email you the day it’s ready.

Physics · Worksheet 4

Projectiles

1. A stone falls from rest for 3 s. How fast is it going? 29.4 m/s ✓

2. A ball rolls off the top of a 20 m wall at 10 m/s. How far from the foot of the wall does it land? Take g = 9.81 m/s².

Answer: ____________ m

3. How fast is the ball moving when it hits the ground?

ProjectileOff the wall

In the air2.02 s

Lands20.2 m

Landing speed22.2 m/s

A ball every quarter second: the same step across, a longer step down each time.

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About anything on your screen: a worksheet, a spreadsheet, a page of code.

It marks the real thing

The question, the cell, the button. Drawn on your screen, right where it is.

Then it shows you

A picture that works beside the answer, and a walk through it one step at a time.

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