### Kinematics Problem 8.1.5

#### Description

A red ball undergoes projectile motion (position is in meters and time is in
seconds). A red trail, arrows representing the
velocity components, and x-y coordinates are given.

#### Question

What is the speed (position given in meters and time in seconds) of the
projectile at *t* = 3.70 s? What is the velocity of the particle? The
acceleration is constant but not necessarily 9.8 m/s^{2}. The scale used
to display velocity vectors is arbitrary. That is, do not assume that a vector
of length five represents a velocity of 5 m/s.
Start

#### Answer

v = 15.4 m/s.

**v **= (8.60 **i** +12.8 **j**) m/s.

#### Reference

See Giancoli-PA: 2-7, Giancoli-SE: 2-7.

#### Credits

Physlet problem authored by Mario Belloni.

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