A car travelling at 10.5 m/s experiences an acceleration of -4.25 m/s 2 until it

Question

A car travelling at 10.5 m/s experiences an acceleration of -4.25 m/s2 until it stops. How long does this take?

2)An object travels -153.4 m in 14.9s while undergoing constant acceleration. If the object’s final velocity is -37.1 m/s, at what velocity was it initially travelling?

3)how long must an object initially travelling at 11.1 m/s undergo an acceleration of 6.26 m/s2 to be displaced 126.3 m?

4)A ball is thrown vertically upward at 12.4 m/s from a height of 8.5 m above the ground. What is its velocity on impact with the ground below?

5)A 0.50 kg ball is thrown at 42o above the horizontal at 19 m/s from a stationary hot air balloon 25 m above the ground. What is the range? (How far away from the balloon does the ball hit the ground? (x-direction only))

Explanation / Answer

here,

1)

initial speed , u = 10.5 m/s

accelration , a = - 4.25 m/s^2

let the time taken be t

final speed , v = 0

u - a * t = 0

10.5 - 4.25 * t = 0

solving for t

t = 2.47 s

the time taken is 2.47 s

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