A skateboard takes 8.0 seconds to accelerate at a constant rate from rest to a speed of 4.0 m/s. If the mass of the skateboard and rider together is 85 kg, what is the net force acting on the bicycle?

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Answer 1 · 2018-02-18T08:37:16

#42.5 \ "N"#

Well, we would need to use Newton's second law of motion, which states that

#F_"net"=m*a#

We know that

#a=(v-u)/t#

Here, #v=4 \ "m/s"#, #u=0 \ "m/s"#, #t=8 \ "s"#

#:.a=(4 \ "m/s"-0 \ "m/s")/(8 \ "s")=0.5 \ "m/s"^2#

Also, we have #m=85 \ "kg"#

#:.F_"net"=85 \ "kg" * 0.5 \ "m/s"^2=42.5 \ "N"#