The height of an object dropped from a height of 400 ft is given by s(t) = -16t² + 400, where t is in seconds after the object is released. Find the velocity of the object when it hits the ground.
A) –5 ft/s B) 5 ft/s C) –160 ft/s D) 160 ft/s
C) –160 ft/s
You might also like to view...
Find the unit tangent vector T and the principal unit normal vector N. r(t) = (cosh t)i + (sinh t)j + tk
A. T = 
(tanh t)i + 
j + 
(sech t)k; N = (sech t)i - (tanh t)k
B. T = - 
(tanh t sech t)i + 
j + 
(sech t)k; N = (-sech t)i - (tanh t)k
C. T = 
(tanh t sech t)i + 
j + 
(sech t)k; N = (sech2 t)i - (sinh t)k
D. T = - 
(tanh t)i + 
j + 
(sech t)k; N = (-sech t)i - (sinh t)k
Solve the problem by using addition, subtraction, multiplication, or division as needed.At the beginning of the year, Mr. Ito put $4806 in the bank. At the end of the year $941 in interest had been earned. How much money was in the account at the end of the year?
A. $3865 B. $4,522,446 C. $5747 D. $5758
Multiply.4a ? 2a2
A. 8a4 B. 8a3 C. 6a3 D. 4a + 2a2
Write the ratio using the word form, the colon form, and the fraction form in lowest terms. 52 red marbles to 80 blue marbles
A. 80 to 52; 80 : 52; 
B. 80 to 52; 80 : 52; 
C. 52 to 80; 52 : 80; 
D. 52 to 80; 52 : 80; 