Need help solving qu stone 1 and 2 A car travelling at a constant speed of 50.0

Question

Need help solving qu stone 1 and 2 A car travelling at a constant speed of 50.0 m/s passes a hidden highway police trooper. One second after the car passes the trooper, the trooper pursues the speeder. If the trooper accelerates at a constant rate of 4.00 m/s^2, how long does it take the trooper to catch the speeding car? 2) A small hoy tosses a rock straight up into the air with an initial velocity of 10 m/s. It falls down and hits him on the head. How high does the rock go? What is the rocks velocity when it hits him on the head? (True Story) 3) A jet flies 20 km due North and then 35.0 km in a direction 60.0 degrees west of north. Find the magnitude and direction of the jet's resultant displacement.

Explanation / Answer

1)

when the car and trooper meet in a time t

in this time the distance travelled by car is

s = 50 * t

when the trooper starts accelerating by this time the car is 50 m in advance

the trooper has to travel a distance 50 m more than car

so

S + 50 = 1/2 * a * t^2

(50 * t) + 50 = 1/2 * a * t^2

t = 25.96 s

2)

h = u^2 / 2* g

h = 100/(2*9.8)

h = 5.1 m

it reaches with the same velocity v = 10 m/s

Related Questions

Navigate

• Browse (All)
• Browse N
• Subjects

---