Question

A racing car starts from rest and has uniform acceliation of 5m/sec . If it travels for 20sec find its final velocity at this instant

Answer 1

Answer:

100m

Explanation:

initial velocity=0 because the car starts from rest

final velocity =?

acceleration=5m/sec

time=20secs

we will use the first equation of motion

v=u+at

v=0+5×20

v=100m

Answer 2

Answer:

100 m/s

Explanation:

We know that v = u + at. -----(1)

As the car starts from rest, its initial velocity is 0, i.e. (u = 0).

a = 5 m/s^2

t = 20 s

so putting the values in equation 1

v = 0 + (5 x 20) = 100 m/s.