A car is traveling at a constant speed of 25.1 m/s on a highway. At the instant this car passes an entrance ramp, a second car enters the highway from the ramp. The second car starts from rest and has a constant acceleration. What acceleration must it maintain, so that the two cars meet for the first time at the next exit, which is 2.19 km away? Number 1.74 Units m/s^2
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- Cheetahs can accelerate to a speed of 20.0m/s in 2.50 s and can continue to accelerate to reach a top speed of 27.8 m/s. Assume the acceleration is constant until the top speed is reached and is zero thereafter. Let the +x-direction point in the direction the cheetah runs. Express the cheetah's top speed vtop in miles per hour (mi/h). Vtop= ______________ mi/h Starting from a crouched position, how much time taccel does it take a cheetah to reach its top speed, what distance d does it travel in that time? taccel = ____________ s d=_____________ m If a cheetah sees a rabbit 129.0 m away, how much time ttotal will it take to reach the rabbit, assuming the rabbit does not move and the cheetah starts from rest? ttotal = _________ sDuring a braking test, a car is brought to rest beginning from an initial speed of 43 mi/hr in a distance of 117 ft. With the same constant deceleration, what would be the stopping distance s from an initial speed of 76 mi/hr? Answer: s = i ftRocket-powered sleds are been used to test the responses of humans to acceleration. Starting from rest, one sled can reach a speed of 510 m/s in 2.37 s and can be brought to a stop again in 3.15 s. Find the acceleration of the sled while accelerating. Answer in units of m/s2. Find the acceleration of the sled when braking. Answer in units of m/s2.
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