How many feet does it take to reach 60 mph in 7 sec.?

Answer 1

It all depends upon how the object is accelerated.

Assuming a constant acceleration so that it reaches 60 mph after 7 seconds starting from stationary:

1 mile = 5280 ft

1 hour = 3600 s

→ 1 mph = 1 mile / 1 hour = 5280 ft / 3600 s = 22/15 ft/s

v = final_velocity = 60 mph = 22/15 ft/s

t = time = 7 s

u = initial velocity = 0

v = u + at

→ v = 0 + at

→ a = v/t = (22/15) / 7

v² = u² + 2as

→ v² = 0 + 2as

→ s = v² / (2a) ft

→ s = (22/15)² / (2 × (22/15) / 7) ft

→ s = (22/15) / (2/7) ft

→ s = 22/15 × 7/2 = 77/15 ft = 5 2/15 ft ≈ 5.13 ft

If you are asking about a car (or other motorised vehicle), then the acceleration is not going to be constant: the vehicle will start accelerating slowly and then accelerate faster. Depending upon the exact shape of the function of the acceleration with relation to time, will change the distance covered.

Answer 2

Not enough information. You also need to know at what rate the object in question accelerates.