Question

Calculate the acceleration of a sprinter that starts from rest to a velocity of 15 m/s in 10 s.

150 m/s2
25 m/s2
5 m/s2
1.5 m/s2

Answer 1

Answer: x=x

0

​

+

2

1

​

(r+v

0

​

)t

1

​

50m=

2

1

​

vt

1

​

t

1

​

−

v

100m

​

In the last 5 0 meters of the race, the sprinter runs with a constant velocity of v , covering a distance of x = 50 m in a time t

2

​

, Solving for, t

2

​

 we find:

t

2

​

=

v

50m

​

We know that the total time of the race, t

1

​

+t

2

​

=10s. With this in mind, we can add the two sprint times together and solve for v :

10s=

v

100m

​

+

v

50m

​

=

v

150m

​

v=

10s

150m

​

=1.5m/s

Explanation:

Answer 2

Explanation:

v=u+at

15=0+a×10

15=10a

a=1.5m/s^2