1) A truck needs to average 45 mi/hr in order tocomplete a haul on time. if the truck has been averaging 43mi/hr for the first 4.0 hours, whats must be its average speed for the remaining 1.0 hour of the trip?
2) A pilot taking off from an aircraft carrier is told to expecta tail wind of 42.0 km/hr. If the pilot's cruising speed is usually 625 km/hr, how long, in minutes will it take the plane to reach and island that is located 25.0 km from the carrier?
3) What is the average speed, in miles/hr, of a golf ball that travels 208 ft in 2.75 seconds?
Please show steps...I dont understand. Thanks a ton =)
2007-09-30 13:57:04 · 1 answers · asked by kickitup21 1 in Science & Mathematics ➔ Physics
1. Average speed = total distance/total time. Desired: time = 5 hr, ave. speed = 45, thus total distance = 225 mi. Truck has gone 4*43 mi. Figure out its distance remaining, divide by time remaining (in this case 1 hr). That's what its ave. speed for the last hour should be.
2. His actual cruise speed wil be 625+42 km/hr. The rest is just as simple. Divide distance by cruise speed, converts hrs to min.
3. This one is all units conversions. DIY.
2007-10-01 04:40:22 · answer #1 · answered by kirchwey 7 · 0⤊ 0⤋