Question

a racing car has uniform acceleration of 4 metre per second squared what distance will it cover in 20seconds after the start

Answer 1

$\huge\mathfrak{Answer:}$

Given:

A racing car has uniform acceleration ,a = 4m/s²

t= 20sec

To find :

The distance will it cover in 20seconds after the start.

${\purple{\boxed{\large{\bold{Formula's}}}}}$

Kinematic equations for uniformly accelerated motion .

$\bf\:v=u+at$

$\bf\:s=ut+\frac{1}{2}at{}^{2}$

$\bf\:v{}^{2}=u{}^{2}+2as$

and $\bf\:s_{nth}=u+\frac{a}{2}(2n-1)$

Solution :

If the car starts from rest .

u = 0 m/s

We have to find The distance will it cover in 20seconds after the start.

From the equation of motion.

$\sf\:s=ut+\frac{1}{2}at{}^{2}$

Now put the given values

$\sf\:S=0\times\:t+\frac{1}{2}\times4\times\:20^2$

$\sf\:S=0+2\times20\times20$

$\sf\:S=2\times400$

$\sf\:S=800m$