Question

A child has a toy on a horizontal platform.the car starts from rest and reaches a maximum speed in 4s.if the mass of the car is 0.1kg and engine has an effective pull of 0.4N ,find the acceleration and the maximum speed of the car.
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Answer 1

Initial velocity = 0m/s

Mass of the car =0.1Kg

Force =0.4N

Then we know that ;

F=ma

$0.4=0.1×a$

$a=\frac {0.4}{0.1}=4m/s^2$

Now by using first equation of motion, velocity can be determined ;

$v=u+at$

$V=0+4×4$

$V=16m/s$

Hence the acceleration is $4m/s^2$ and maximum speed is $16m/s$