Kimeaslyn80idn
Answered

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Direction: Answer what is being asked. (Show your solution)

11. The boy runs with a speed from 35m/s to 20 m/s after 3 s.

12. The boy from rest is running with a speed of 78 m/s at 70s. What is the acceleration?

13. A jeep slows down from a speed of 220m/s to rest in 80s. What is the acceleration?

14. The train slows down from a speed of 730m/s to 350 m/s after 80s.

15. The train slows down from a speed of 550m/s to 300 m/s after 90s.

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Sagot :

Kenchin2590idn

1. GIVEN:

4.0 m/s

2.0 seconds

2.0 m/s.

UNKNOWN:

The acceleration of the boy.

FORMULA :

a = average acceleration

v = final velocity

V_{0}V

0

= starting velocity

t = elapsed time

SOLUTION:

4.0m/s.+2.0 m/s.

ANSWER:

=6.0 m/s^2

2. 6.25 m/s²

Given:

V = 25.0 m/s

t = 4.0 s

Find: ACCELERATION

a=\frac{y}{t}a=

t

y

Substitute the values:

a=\frac{25.0 m/s} {4.0s}a=

4.0s

25.0m/s

a=6.25 m/s^{2}a=6.25m/s

2

3. FINAL VELOCITY

Given

Initial Velocity (u) = 90 km/h

Acceleration (a) = 5.0 m/s²

Time (t) = 2.0 s

Final Velocity (v) = ?

Convert from km/h to m/s

90 km/h / 3.6 = 25 m/s

v = u + at

v = 25 + (5.0)(2.0)

v + 25 + 10.0

v = 35.0 km/h