Question

ANS: T PTS:4 The slope of a distance vs. time graph is the acceleration. ANS: A racecar driver steps on the gas, changing his speed from 10 m/s to 30 m/s in 4 seconds. The acceleration of the racecar is 10 m/s?. ANS: F When an object reaches its terminal speed, its acceleration is zero. ANS:T As you go higher and higher above the surface of the earth, the mass of a body stays constant. ANS: T As an artillery shell travels from the gun to the target, the projectile's vertical speed changes, but it's horizontal speed stays constant. ANS: T 6. PTS: 4 7. PTS: 4 8. PTS: 4 9. PTS: 4 10. PTS: 4

Answer 1

6) False

slope of distance - time curve is dx/dt = speed of particle

7) False

acceleration is (a) = change in velocity/time

= (30-10)/4 =20/4 = 5m/s²

^{8) True}

^{terminal velocity is constant velocity so acceleration is zero.}

^{9) true}

^{mass of a body is amount of matter of object. it is constant at everywhere in nature}

^{(10) True}

in horizental direction there is no force so speed of projectle is constant but in verticle direction due to gravity force velocity changes.