How would you calculate the speed (in #m/s#) of a skateboarder who accelerates from rest for 4 seconds down a ramp at an acceleration of #3 m/s^2#?

2 Answers
Apr 2, 2018

Applicable kinematic expression is

#v=u+at#

Inserting given values we get

#v=0+3xx4#
#v=12\ ms^-1#

Apr 2, 2018

#12 \ "m/s"#

Explanation:

Using the basic kinematics equation,

#v=u+at#

  • #u# is the initial speed

  • #a# is the acceleration

  • #t# is the time

And so,

#v=0 \ "m/s"+3 \ "m/s"^2*4 \ "s"#

#=12 \ "m/s"#