Trinal tin The speed of a car increases from 12 mis to
20 mis in 4 seconds.
a
t
14 -
127
10-
8-
6
= 20-12
4
11
2 m/s²
4
2
d)
vt
0
o 2 4 8 12 16 20 24 28 30 32
30 32 34
(2012) (4)
32 m

An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?