l of the car 11. Assume a car starts from rest at t 0 and accel- erates as shown

Question

l of the car 11. Assume a car starts from rest at t 0 and accel- erates as shown in the a vs t graph on the right. p(m/6*) Find the velocity at (a) t=4s, (b) t=10s. 20 ) t(s) -4 12. A snail starts at z =-10cm. The u vs t graph on the right shows the snail's velocity as it moves (a) Find the snail's acceleration in units of (b) Find the snail's acceleration in units of (c) Find the snail's position in units of cm at (d) Find the snail's position in units of cm at (m/hr) along a straight line. cm/min 2 at t = 5min. 10 IS t(min) cm/min2 at t = 15min. -2 t 5min. t 15min.

Explanation / Answer

11. area of a vs t curve will give change in velocity.

(A) v - 0 = 4 x 4

v = 16 m/s

(B) v = (5 x 4) + (4 x 2.5 / 2) - (4 x 2.5/ 2)

V= 20 m/s

12. (A) a = slope = (2 x 100 cm / 60 min) / (10 min)

a = 0.33 cm/min^2

(b) a = - (4 x 100 / 60) / (20 - 10)

a= -0.67 cm / min^2

(c) x - (10) = (100 cm / hr x (5/60)hr) / 2

x = 10 + 4.2

x = 14.2 cm

(d) x - 10 = (200x (15/60) / 2 )

x = 10 + 25

x = 35 cm

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